I suspect that somewhere along the way you manually ran some upgrade scripts and it did not record them so it is trying to run the script again.
You could try removing the script it is erroring on and see if it can run the next one, ie remove the file
/Setup/applications/mojoportal-core/SchemaUpgradeScripts/mssql/2.3.7.7.config
or comment out the part of the script that is adding the "RolesChanged" column to mp_Users table