# Android Wallet - Credential is in an outaded format

**URL:** <https://community.blockcerts.org/t/android-wallet-credential-is-in-an-outaded-format/2747>\
**Category:** Technical\
**Created:** [February 9, 2021, 4:40pm UTC](https://community.blockcerts.org/t/android-wallet-credential-is-in-an-outaded-format/2747 "2021-02-09T16:40:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nSync](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/nsync/32/742_2.png) [@nSync](https://community.blockcerts.org/u/nSync)\
**Post date:** [February 9, 2021, 4:40pm UTC](https://community.blockcerts.org/t/android-wallet-credential-is-in-an-outaded-format/2747/1 "2021-02-09T16:40:22Z")

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Hi!  
I’m currently working on Blockcertes for my thesis and I have created my own certificate with cert-tools and cert-issuer in the bitcoin testnet but, when I try to view my certificate with the app “Blockcerts”, for android, I get a problem.  
The certificate is visible, the various info are readable and can be verified but, when I try su view my credential on the app I get the error message: “This credential is in an outdated format and cannot be displayed correctly.”

I have created it with the V2 version of cert-tools.  
Is this a common error for the V2? How can I fix it ?