Error with pull requests fatal: Couldn't find remote ref refs/pull-requests/

[karthik Panuganti]

We upgraded bitbucket server from 6.10.1 to 7.5.1 and we are facing issues with Existing and new PRs 

Here is the error

ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from http://xxxxx:7990/scm/DEVOPS/examplepipelineproject-v2.0.git
    at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:894)
    at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1161)
    at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1192)
    at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:120)
    at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:144)
    at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:120)
    at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:303)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:429)
Caused by: hudson.plugins.git.GitException: Command "git fetch --no-tags --progress http://xxxxxxxx:7990/scm/DEVOPS/examplepipelineproject-v2.0.git +refs/pull-requests/310/from:refs/remotes/origin/PR-310" returned status code 128:
stdout: 
stderr: fatal: Couldn't find remote ref refs/pull-requests/310/from

    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2042)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1761)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$400(CliGitAPIImpl.java:72)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:442)
    at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:892)
    ... 8 more
ERROR: Error fetching remote repo 'origin'
[Bitbucket] Notifying pull request build result
[Bitbucket] Build result notified
ERROR: Maximum checkout retry attempts reached, aborting
Finished: FAILURE