1023 - Function requires a header.

Description
An attempt was made to invoke a Function without a header, where the given Function requires one.
Example
Config:
Alias { .Targets = { 'a', 'b' } }
Output:
c:\Test\fbuild.bff(2):(1) FASTBuild Error #1023 - Alias() - Function requires a header. { ^ \--here
Fix:
Alias( 'MyAlias' ) { .Targets = { 'a', 'b' } }