Bamboo scan not build plan with plan repository through bitbucket repository stored bamboo spec

[Hema]

Hi,
I am facing issue on bamboo server, when bamboo scans for bamboo specs stored on bitbucket repository then it is failing for creating plan with plan repository. Error : Request to stash failed. Response body is empty and failed with 401.
And If I removed plan repository from bamboo java spec then bamboo built plan but without plan repository.

Note : I have provided ssh clone url, ssh public key and ssh private key for respective plan repository but still failing through bitbucket repository stored spec.
Ssh enabled om bamboo.
I am using bitbucket server repository for plan repo

Its urgent, could you please help me