score:18
the function expects a list(of manufacturer) return type, not an ienumerable(of manufacturer), so adding a .tolist() to the return value should fix it:
return allmfrs.except(unavailablemfrs).tolist()
score:3
your function is declared as returning list(of manufacturer), but your return statement is returning only an ienumerable(of manufacturer). change the return statement to:
return allmfrs.except(unavailablemfrs).tolist()
if you turn option strict on, i believe vb will catch this kind of error at compile time, instead of blowing up at runtime.
score:3
the problem is that enumerable.except returns ienumerable<t>, but your return type is list(of t).
change your last line to:
return allmfrs.except(unavailablemfrs).tolist()
Source: stackoverflow.com
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