E-CE0011 — min/max over an empty collection

Error Type	Compile Error
Phase	compiling the problem into an OMMX instance
Python exception	`ValueError`

Message

`{operator}` requires a non-empty collection.

Possible fix: ensure the iterated range, set, or array is non-empty.

Cause

A fold such as min or max was evaluated over a collection that turned out to be empty for the given instance data. Unlike sum or prod, these operators have no neutral element and are undefined on empty input.

Fix

Ensure the iterated range or set is non-empty for every instance (e.g. that array lengths and range bounds are at least 1), or restructure the model to use sum/prod, which are well-defined on empty collections.