1601 - Concurrency Group '%s' already defined.
Description
    
Concurrency Groups defined in Settings() must be uniquely
named.
    
Example
    
Config:
    Settings
{
    .Group1 = [ .ConcurrencyGroupName = 'link' .ConcurrencyLimit = 4 ]
    .Group2 = [ .ConcurrencyGroupName = 'link' .ConcurrencyLimit = 4 ]
    .ConcurrencyGroups = { .Group1, .Group2 }
}
Output:
C:\Test\fbuild.bff(1,1): FASTBuild Error #1601 - Settings() - Concurrency Group 'link' already defined.
Settings
^
\--here
Fix:
Settings
{
    .Group1 = [ .ConcurrencyGroupName = 'link' .ConcurrencyLimit = 4 ]
    .Group2 = [ .ConcurrencyGroupName = 'test' .ConcurrencyLimit = 4 ]
    .ConcurrencyGroups = { .Group1, .Group2 }
}
    