Invalid operation on a variable-size shelf encountered.
#2044 Compile-time error
Invalid operation on a variable-size shelf encountered.
Additional Information
Trying to insert an item X item M of Y 'Z'.
or
Trying to insert an item X item M of Y 'Z', maximum size is N.
where X is 'BEFORE' or 'AFTER', Y is the type of the shelf, Z its
name, M the position of insertion, N the maximum size. If N isn't
given, the insertion point is too low.