# Cert-Viewer error when performed the verify certificate button
**URL:** https://community.blockcerts.org/t/cert-viewer-error-when-performed-the-verify-certificate-button/1854
**Category:** Support
**Created:** [April 24, 2019, 2:44am UTC](https://community.blockcerts.org/t/cert-viewer-error-when-performed-the-verify-certificate-button/1854 "2019-04-24T02:44:26Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Fernando](https://community.blockcerts.org/u/Fernando)
#### Post date: [April 24, 2019, 2:44am UTC](https://community.blockcerts.org/t/cert-viewer-error-when-performed-the-verify-certificate-button/1854/1 "2019-04-24T02:44:26Z")
Hello,
I’m testing the blockcerts for creating models, issuing certificates without problem. My next step is to visualize and verify my .json signed in the cert-viewer component.
Before start the tests in cert-viewer tool, I uploaded my json file in blockerts universal verifier to make sure that my certificate was without errors
So, I configured the cert-viewer at the local url, and clicked on a valid certificate to see it (hosted in cert\_data) and this work to view it. But I realize when I click in the button “verify certificate” nothing happen.
After perform click, I catch some erros listed bellow…
Obs: I just changed the original host in log to [http://www.mywebsite](http://www.mywebsite).
- Debug mode: off
2019-04-23 23:00:36,295 - werkzeug - INFO - \* Running on [http://127.0.0.1:7000/](http://127.0.0.1:7000/) (Press CTRL+C to quit)
2019-04-23 23:00:50,216 - root - DEBUG - Retrieving certificate for uid=96cf7092-1343-4943-a9e1-a556850e4847
2019-04-23 23:00:50,217 - root - DEBUG - Found certificate for uid=96cf7092-1343-4943-a9e1-a556850e4847
2019-04-23 23:00:50,245 - werkzeug - INFO - 127.0.0.1 - - [23/Apr/2019 23:00:50] “GET /96cf7092-1343-4943-a9e1-a556850e4847 HTTP/1.1” 200 -
2019-04-23 23:00:52,813 - root - DEBUG - Retrieving certificate for uid=96cf7092-1343-4943-a9e1-a556850e4847
2019-04-23 23:00:52,814 - root - DEBUG - Found certificate for uid=96cf7092-1343-4943-a9e1-a556850e4847
2019-04-23 23:00:52,824 - urllib3.connectionpool - DEBUG - Starting new HTTP connection (1): www.mywebsite:80
2019-04-23 23:00:52,848 - urllib3.connectionpool - DEBUG - [http://www.mywebsite:80](http://www.mywebsite:80) “GET /UFP.json HTTP/1.1” 200 3748
2019-04-23 23:00:52,849 - root - DEBUG - Found results at url=http://www.mywebsite/UFP.json
2019-04-23 23:00:52,854 - urllib3.connectionpool - DEBUG - Starting new HTTP connection (1): www.mywebsite:80
2019-04-23 23:00:52,881 - urllib3.connectionpool - DEBUG - [http://www.mywebsite:80](http://www.mywebsite:80) “GET / HTTP/1.1” 200 209
2019-04-23 23:00:52,882 - root - ERROR - Unhandled Exception: Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py”, line 1813, in full\_dispatch\_request
rv = self.dispatch\_request()
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py”, line 1799, in dispatch\_request
return self.view\_functionsrule.endpoint
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/views.py”, line 88, in view
return self.dispatch\_request(\*args, \*\*kwargs)
File “/ufp/cert-viewer/cert\_viewer/views/verify\_view.py”, line 11, in dispatch\_request
view\_model = self.view(\*args, \*\*kwargs)
File “/ufp/cert-viewer/cert\_viewer/verifier\_bridge.py”, line 13, in verify
verify\_response = verifier.verify\_certificate(certificate, options=options)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/cert\_verifier/verifier.py”, line 22, in verify\_certificate
issuer\_info = connectors.get\_issuer\_info(certificate\_model)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/cert\_verifier/connectors.py”, line 240, in get\_issuer\_info
revoked\_json = get\_remote\_json(revocation\_url)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/cert\_verifier/connectors.py”, line 183, in get\_remote\_json
remote\_json = r.json()
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/requests/models.py”, line 897, in json
return complexjson.loads(self.text, \*\*kwargs)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/simplejson/ **init**.py”, line 518, in loads
return \_default\_decoder.decode(s)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/simplejson/decoder.py”, line 370, in decode
obj, end = self.raw\_decode(s)
File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/simplejson/decoder.py”, line 400, in raw\_decode
return self.scan\_once(s, idx=\_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
2019-04-23 23:00:52,888 - werkzeug - INFO - 127.0.0.1 - - [23/Apr/2019 23:00:52] “GET /verify/96cf7092-1343-4943-a9e1-a556850e4847 HTTP/1.1” 500 -
---
### Author:  [@Fernando](https://community.blockcerts.org/u/Fernando)
#### Post date: [April 25, 2019, 2:13am UTC](https://community.blockcerts.org/t/cert-viewer-error-when-performed-the-verify-certificate-button/1854/2 "2019-04-25T02:13:08Z")
Well,
I decided to change to cert-web-component, it’s better.
Att,
Fernando.