in version 3.1.6.1 the multiline parameters does not work anymore like:

parameters:  """
    PROJECT_NAME=${projectName}
    RELEASE_NAME=${releaseName}
    STORAGE_LOCATION=${lastBuild}
    DASHBOARD_LOCATION=${lastBuild}\\..
RegressionTest""",

Unfortionatly there is no documentation on this and after looking into the code it seems that it needs to be programmed like:

parameters: [
              "PROJECT_NAME"       : "${projectName}",
              "RELEASE_NAME"       : "${releaseName}",
              "STORAGE_LOCATION"   : "${lastBuild}",
              "DASHBOARD_LOCATION" : "${lastBuild}\\..
RegressionTest"
            ],

Please document these kind of changes !!