# Cert-Web-Component - Error when missing one parameter from cert-tools **URL:** \ **Category:** Support\ **Created:** [April 25, 2019, 2:36am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860 "2019-04-25T02:36:17Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [April 25, 2019, 2:36am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/1 "2019-04-25T02:36:17Z")
Hello, I’m writing this topic, because it maybe be useful for someone that catch the same error that I did. After issue my certificate, I achieve to view and to verify it in the blockcerts universal verifier website. Very well, the certificate was fine, and it has been passed in all tests. So, I decided to setup the cert-web-component in my application to see the certificate. I was sure that It was without error, because it was validated in the Universal Verifier. But, to my surprise, I got one error from Cert-Web-Component. **# Referenced certificate doesn’t appear to be valid** So, after some hours testing and matching with others Json certificates, I discovered the problem. The field [–issuer\_signature\_lines ISSUER\_SIGNATURE\_LINES] was missing in cert-tools config.ini file (the certificate model). Without this parameter the cert-web-component can’t render the certificate. I think it should work because according with the documentation ([https://github.com/blockchain-certificates/cert-tools](https://github.com/blockchain-certificates/cert-tools)) it’s a optional parameter, and as I said in the begin of the thread, it’s working, when uploaded to universal viewer, even missing the issuer\_signature\_lines field… Att, Fernando. ---
**Author:** ![aronning](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@aronning](https://community.blockcerts.org/u/aronning)\ **Post date:** [May 8, 2019, 3:29pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/2 "2019-05-08T15:29:12Z")
Hi @Fernando, if you have a github account, it may be good to file this as an issue on the cert-web-component repo. I’m not sure if it really is supposed to be required or not at this time. ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [May 8, 2019, 4:04pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/3 "2019-05-08T16:04:39Z")
Hi! I haven’t… I’ll create one to register the issue there… Thanks. ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [May 20, 2019, 1:08pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/4 "2019-05-20T13:08:03Z")
Hi @Fernando, you could achieve displaying certificates on your webpage using: [https://github.com/blockchain-certificates/blockcerts-verifier](https://github.com/blockchain-certificates/blockcerts-verifier) It is an update from the cert-web-component, as it handles natively both display and verification. The API allows you flexibility in the behavior and I think you could get where you want. ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 11, 2019, 4:05pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/5 "2019-06-11T16:05:08Z")
@lemoustachiste The blockcerts-verifier works with ethereum rospnet and bitcoin testnet ? I tried to use cert-web-component with ethereum without success… ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 11, 2019, 5:04pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/6 "2019-06-11T17:04:18Z")
Hi @Fernando, the blockcerts-verifier is agnostic of the chain. The only thing is that with a test chain, the verification process should appear gray and the validation message is different. We have several test chains that we verify with blockcerts-verifier. What is exactly the issue you are encountering? Could you provide a link/screenshot? Do you have errors in the console? Thanks ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 11, 2019, 5:41pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/7 "2019-06-11T17:41:12Z")
Hello @lemoustachiste Thanks for answering, I still didn’t tried cert-verifier… I just tried cert-web-component with bitcoin (working) and now trying it to ethereum (not working…)… When I click to validade button… the console print: Computing local hash… validate-certificate.html:86 Comparing local and remote hashes… validate-certificate.html:86 Checking the receipt… and stop the JavaScript Program… ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 11, 2019, 7:00pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/8 "2019-06-11T19:00:33Z")
Could you share the certificate you are trying to validate? I can’t really help if I don’t see what’s happening ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 11, 2019, 7:29pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/9 "2019-06-11T19:29:19Z")
Sure, Link [Cert](https://1drv.ms/u/s!Aovw4YAJO2UQmCFKjHn2dFz7FYnW) ![ErrorValidate](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/66d9ae9163db453a91d581e17d371b844661b0dd.png) ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 11, 2019, 9:24pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/10 "2019-06-11T21:24:34Z")
Verification happened successfully using blockcerts-verifier on [blockcerts.org](http://blockcerts.org) cert-web-component has not been maintained and has been replaced by blockcerts-verifier. I encourage you to use it for displaying and verifying your certificates. ![24](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/a8cefced1abbe5ceea0d883cd85efdf079c44d6d.png) ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 12, 2019, 1:30am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/11 "2019-06-12T01:30:49Z")
Hello @lemoustachiste I took your suggest… and changed my project to blockcerts-verifier. It’s a pretty better than web-component, and work to ethereum and bitcoin. But, I realize some points: a) Maybe it doesn’t work to check revocation list (Ethereum). I tried revocate the certificate upload here… but it still apear valid in verify button ([https://certedu.eastus.cloudapp.azure.com/rev\_UFP\_2.json](https://certedu.eastus.cloudapp.azure.com/rev_UFP_2.json)). b) I’m not sure if it will allow to change the src programmatically, using for example JQuery. I tried to change src with JQuery (the same way I did with web-component) but it doesn`t work.. I created a Id and find it to change. I don`t know if it allow do this, the same way web-component. I`ll keep trying it. Att, Fernando. ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 12, 2019, 9:15am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/12 "2019-06-12T09:15:15Z")
Revocation on Ethereum works, if you try verifying this certificate you will get the verification error on the revocation: [https://raw.githubusercontent.com/blockchain-certificates/cert-verifier-js/master/test/fixtures/ethereum-revoked-2.0.json](https://raw.githubusercontent.com/blockchain-certificates/cert-verifier-js/master/test/fixtures/ethereum-revoked-2.0.json) As to your second point I was not sure it was working, so I tried locally and it didn’t. But I figured it would be an easy change to make for this to work, so I went ahead and made it. It’s in PR now: [https://github.com/blockchain-certificates/blockcerts-verifier/pull/94](https://github.com/blockchain-certificates/blockcerts-verifier/pull/94), but once merged (during the day), the next release should allow you to do it. ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 12, 2019, 10:00am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/13 "2019-06-12T10:00:57Z")
@Fernando v.1.14.0 is out and handles your need. ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 12, 2019, 10:56am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/14 "2019-06-12T10:56:27Z")
Cool ! Amazing component ! The src feature work very well, and I found the error in my revocate file. Everything is working now with Cert-Verifier. Thank you very much @lemoustachiste ![Solved](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/447b3ed857c37a1b62707fa4ff1d47cc5ecf639d.png) ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [June 12, 2019, 11:49am UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/15 "2019-06-12T11:49:40Z")
Great, nice to hear it worked perfectly well for you. If you have the time, do you think you could add some `pt` translations here: [https://github.com/blockchain-certificates/cert-verifier-js/blob/master/src/data/i18n.json](https://github.com/blockchain-certificates/cert-verifier-js/blob/master/src/data/i18n.json)? It’s for the verification process. We want to internationalize the component even more (all internal strings) but haven’t had the time just yet, but this would be a good start already 🙂 ---
**Author:** ![Fernando](https://avatars.discourse-cdn.com/v4/letter/f/779978/32.png) [@Fernando](https://community.blockcerts.org/u/Fernando)\ **Post date:** [June 12, 2019, 3:00pm UTC](https://community.blockcerts.org/t/cert-web-component-error-when-missing-one-parameter-from-cert-tools/1860/16 "2019-06-12T15:00:05Z")
Ok, I’ll take a time to translate it to pt-Br.