Problem

When attempting to compute a PondPack model, the following error occurs:

Engine Error Message - Argument 'Number' must be greater or equal to zero.  

Solution

This is due to a known issue with storm tags.

Steps:

1. Open Calculation Options
2. Double-click on the calculation option that is active to display its properties.
3. If "Storm Tag Prefix" is set to "User Defined", edit the "User Tag" field so that it contains 6 characters or less.
4. Edit other calculation options to meet this requirement.

Note: Storm tags are a legacy option, so this is more likely to occur in models upgraded from an older version. Newer concepts such as Scenarios and Storm Events should make the storm tag concept unnecessary. Therefore removing or shortening the name is a valid workaround.

Related Defect: #44897