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Our Jenkins(J) is linked with Bitbucket(BB). A pull request(PR) is created in BB, then it's auto-built in J, then it's updated with a commit but BB doesn't update the branch, so J can't check it out. Solution: open the PR in BB web ui.
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hudson.plugins.git.GitException: Could not checkout ddd9a8b6f884a020b38dfcfbfa86878955fc95a4