Error in subbash :

export extractor_version=$(cd extractor; mvn help:evaluate -Dexpression=project.version -q -DforceStdout)

result in output contains colors output :

1.0'$'\033''[0m.tar.gz'

Remove it with :

./somescript | sed -r "s/\x1B\[([0-9]{1,3}(;[0-9]{1,2};?)?)?[mGK]//g"