| ERROR | FORG0003: fn: zero-or-one() called with a sequence containing more than one item |
| CAUSE | sequence with more than one item was passed into fn: zero-or-one() function |
| ACTION | correct input argument to fn: zero-or-one() function |
| ERROR | FORG0003: fn: zero-or-one() called with a sequence containing more than one item |
| CAUSE | sequence with more than one item was passed into fn: zero-or-one() function |
| ACTION | correct input argument to fn: zero-or-one() function |