1020 - Function can only be invoked once.

Description
A Function which can only be invoked once per configuration was encountered a second time.
Example
Config:
Settings { .CachePath = '\\cache-server/.cache' } Settings { .CachePath = '\\cache-server/.cache' }
Output:
c:\Test\fbuild.bff(5):(1) FASTBuild Error #1020 - Settings() - Function can only be invoked once. Settings ^ \--here
Fix:
Settings { .CachePath = '\\cache-server/.cache' }