Build failed in Jenkins: beam_SeedJob #1454

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GitHub pull request #5058 of commit d515a361feb60331dd69f259ebba8379bb354b88, no merge conflicts.
Setting status of d515a361feb60331dd69f259ebba8379bb354b88 to PENDING with url https://builds.apache.org/job/beam_SeedJob/1454/ and message: 'Build started sha1 is merged.'
Using context: Jenkins: Seed Job
[EnvInject] - Loading node environment variables.
Building remotely on beam3 (beam) in workspace <https://builds.apache.org/job/beam_SeedJob/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/beam.git # timeout=10
Fetching upstream changes from https://github.com/apache/beam.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/beam.git +refs/heads/*:refs/remotes/origin/* +refs/pull/5058/*:refs/remotes/origin/pr/5058/*
 > git rev-parse refs/remotes/origin/pr/5058/merge^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/pr/5058/merge^{commit} # timeout=10
Checking out Revision 35d7c52e94f17c249f79bf674730dffbff766184 (refs/remotes/origin/pr/5058/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 35d7c52e94f17c249f79bf674730dffbff766184
Commit message: "Merge d515a361feb60331dd69f259ebba8379bb354b88 into a79d1b4fc27eb81db0d9a773047820a206f3d238"
First time build. Skipping changelog.
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Processing DSL script job_00_seed.groovy
Processing DSL script job_beam_Inventory.groovy
Processing DSL script job_beam_PerformanceTests_Dataflow.groovy
Processing DSL script job_beam_PerformanceTests_FileBasedIO_IT.groovy
Processing DSL script job_beam_PerformanceTests_FileBasedIO_IT_HDFS.groovy
Processing DSL script job_beam_PerformanceTests_HadoopInputFormat.groovy
Processing DSL script job_beam_PerformanceTests_JDBC.groovy
Processing DSL script job_beam_PerformanceTests_MongoDBIO_IT.groovy
Processing DSL script job_beam_PerformanceTests_Python.groovy
Processing DSL script job_beam_PerformanceTests_Spark.groovy
Processing DSL script job_beam_PostCommit_Java_GradleBuild.groovy
ERROR: Type of item "beam_PostCommit_Java_MavenInstall" does not match existing type, item type can not be changed
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Jenkins build is back to normal : beam_SeedJob #1455

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