1046 - #if expression cannot start with boolean operator.
Description
    The first token in an #if expression should be a define (that exists or not).
    
Example
    
Config:
    #if &&AAA
#endif
Output:
c:\test\fbuild.bff(1,5): FASTBuild Error #1046 - #if expression cannot start with boolean operator.
#if &&AAA
    ^
    \--here
Fix:
#if AAA && BBB
#endif
    