Overnight script returning scripting error 201 at Set Field - filemaker

Question

I have a script setup to run overnight on my Filemaker server, but every night it returns this error:
Schedule "Recheck All Flags" scripting error (201) at "MasterDatabase : Recheck All Flags : ### : Set Field
Where ### is just a random number, probably the line in the script. In the above example let's just say it was 398.
I can't copy and paste the script to here, but it is very simple. It's one big loop over all records in the database and it checks a bunch of If statements. It looks like:
If [MasterDatabase::Start date = ""]
Set Field [MasterDatabase::Flagged for Discrepancy; "Yes"]
Commit Records/Requests [With dialog:Off]
End If
Why might this be failing when running on the server overnight?

Answer 1

Make sure you tell the server to go to the correct layout before the script starts, when the server starts up the script it will do the work on the layout that it is configured for the DB to open by default.
You can do something like:
If [ $$PLATFORM = "Server" ]
(Go to Layout X)
End If
The global variable $$PLATFORM can be defined in your On First Window Open Script like so:
Case (
PatternCount ( Get ( ApplicationVersion ) ; "Server" ) ;
"Server" ;
PatternCount ( Get ( ApplicationVersion ) ; "Data API" ) ;
"Data API" ;
Get ( SystemPlatform ) = 4 ;
"Web" ;
Choose (
Get ( Device ) ;
"Desktop" ; // 0 - Unknown
"Desktop" ; // 1 - Mac
"Desktop" ; // 2 - PC
"Tablet" ; // 3 - Tablet
"Phone" // 4 - Phone
)
)
If you already have that covered then make sure whatever user you are using for the PSOS has access to that layout, records scripts and fields.