The error suggest that there is a script running on the Backend. You need to wait for the script to get completed. Refer [URL]  The Symmetrix DMX or VMAX is currently running a script. There are a variety of reasons why a script can be running on the Service Processor. Examples are listed below. However, the below list may not be exhaustive.
   Am unable to commit mapping script getting below error, how to check if any other script running background?  "Error occurred while Preparing     The configuration server can't obtain the necessary resources to perform the requested service The configuration change session has failed."
Map script error