1112 - Function call arguments should be literals or variables.

Description
A function call can be invoked with literals or variables only. Other constructs cannot be passed.
Example
Config:
function Func( .Arg ){} Func( = )
Output:
C:\test\fbuild.bff(2,7): FASTBuild Error #1112 - Function call arguments should be literals or variables. Func( = ) ^ \--here
Fix:
function Func( .Arg ){} Func( 'Arg' )