After upgrading the from Atlassian Bitbucket v9.4.9 to Atlassian Bitbucket v10.2.1 gettig error

[Amar]

Hi Team,
We have upgraded the Bitbucket  from Atlassian Bitbucket v9.4.9 to Atlassian Bitbucket v10.2.1 getting certification validation error while doing apps upgrade.

Configuration safety check failed!

Certificates Truststore Folder :

/opt/atlassian/application-data/bitbucket/shared/upmconfig/truststore

UPM TrustStore directory is empty : Installations will fail because no certificate is installed for signature verification.

Configuration status details

 File or directory /opt/atlassian/application-data/bitbucket/shared/upmconfig/truststore is not readonly

 File or directory /opt/atlassian/application-data/bitbucket/shared/upmconfig/truststore belongs to the current user [atlbitbucket]

followed the instructions and directory permission are same and user name is followed same. certificates has installed on recommended directory.

can you please suggest.

Regards,

Amar