1009 - Unknown variable '%s'.
Description
A variable which has not been defined was referenced inside another variable assignment or concatenation.
Example
Config:
.Var = '$OtherVar$'
Output:
c:\Test\fbuild.bff(1):(10) FASTBuild Error #1009 - Unknown variable 'OtherVar'.
.Var = '$OtherVar$'
^
\--here
Fix:
.OtherVar = 'String'
.Var = '$OtherVar$'