This error message was introduced in Resilio Connect version 2.12 and appear on start of a job run with trigger or a script job.
This error means that the user restricted access to the computer for Resilio Connect Admin, from the Agent UI settings:
To fix this error message, the user needs to allow running scripts on the computer. Start the job run again after the permissions are granted.
Error code SE_SM_SCRIPTS_ARE_FORBIDDEN.