help with M2-REPO

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help with M2-REPO

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hey all \\

i need your help im trying to set up the mahout and maven with eclipse
but this error always came up i dont know what to do

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-eclipse-plugin:2.9:add-maven-repo (default-cli) on project standalone-pom: Unable to write to file: /.metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.jdt.core.prefs -> [Help 1]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1]

the variable M2-REPO is non-modefied