Build failed in Jenkins: beam_PostCommit_Java_RunnableOnService_Spark #469

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error: 'refs/remotes/origin/pr/900/head' exists; cannot create 
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 ! [new ref] refs/pull/900/head -> origin/pr/900  (unable to update 
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error: 'refs/remotes/origin/pr/913/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/915/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/92/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/921/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/924/head' exists; cannot create 
'refs/remotes/origin/pr/924'
 ! [new ref] refs/pull/924/head -> 

Build failed in Jenkins: beam_PostCommit_Java_RunnableOnService_Spark #469

[Apache Jenkins Server]

See 


--
[...truncated 9912 lines...]
error: 'refs/remotes/origin/pr/900/head' exists; cannot create 
'refs/remotes/origin/pr/900'
 ! [new ref] refs/pull/900/head -> origin/pr/900  (unable to update 
local ref)
error: 'refs/remotes/origin/pr/901/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/907/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/908/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/909/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/91/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/910/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/911/head' exists; cannot create 
'refs/remotes/origin/pr/911'
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error: 'refs/remotes/origin/pr/912/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/913/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/914/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/915/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/916/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/919/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/92/head' exists; cannot create 
'refs/remotes/origin/pr/92'
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error: 'refs/remotes/origin/pr/920/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/921/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/922/head' exists; cannot create 
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local ref)
error: 'refs/remotes/origin/pr/923/head' exists; cannot create 
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error: 'refs/remotes/origin/pr/924/head' exists; cannot create 
'refs/remotes/origin/pr/924'
 ! [new ref] refs/pull/924/head ->