Build failed in Jenkins: beam_SeedJob #1067

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See <https://builds.apache.org/job/beam_SeedJob/1067/display/redirect>

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GitHub pull request #4677 of commit 998f3898fbff8c1ad4c4cabf7b5657ad35b793e6, no merge conflicts.
Setting status of 998f3898fbff8c1ad4c4cabf7b5657ad35b793e6 to PENDING with url https://builds.apache.org/job/beam_SeedJob/1067/ and message: 'Build started sha1 is merged.'
Using context: Jenkins: Seed Job
[EnvInject] - Loading node environment variables.
Building remotely on beam2 (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/4677/*:refs/remotes/origin/pr/4677/*
 > git rev-parse refs/remotes/origin/pr/4677/merge^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/pr/4677/merge^{commit} # timeout=10
Checking out Revision 02502314ba6e10c502c698ebaab1f83570e44687 (refs/remotes/origin/pr/4677/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 02502314ba6e10c502c698ebaab1f83570e44687
Commit message: "Merge 998f3898fbff8c1ad4c4cabf7b5657ad35b793e6 into 1488cb90a69ee2bf3adc43f7157ba3641ed3e04d"
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
beam5
ERROR: (job_beam_Inventory.groovy, line 26) No signature of method: javaposse.jobdsl.dsl.helpers.NodeParamContext.defaultNode() is applicable for argument types: (java.util.ArrayList) values: [[beam5]]
Possible solutions: defaultNodes(java.util.List), getDefaultNodes()

Jenkins build is back to normal : beam_SeedJob #1068

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See <https://builds.apache.org/job/beam_SeedJob/1068/display/redirect>