1071 - Unexpected token '%s'.

Description
An unexpected token was encounered while partsing an If() header. This error is a fallback for when a more specific error is unavailable.
Example
Config:
If( !100 ) { }
Output:
C:\test\fbuild.bff(1,6): FASTBuild Error #1256 - If() - Unexpected token '100'. If( !100 ) ^ \--here
Fix:
If( !false ) { }