User drew own entities in FLEXPIPE Layer. That layer is only to be used by HydraCAD Unhandled Except. V50

Bad prettypipes.dat file

Bug with the new Flexible Hose Connections. Drawing with FHCs will get this error, drawings without will not get the error Unhandled Except. Dialog Box v50

Missing or frozen layer Unhandled Except. v50

Pretty Pipes requires line type TRACKS. This line type is missing from the drawing. Unhandled Except. v50

Unhandled Exception has occurred in a component in your application

Index was out of range. Must be non-negative and less than the size of the collection.

1. Bad PRETTYPIPES.DAT file

2. corrupt xrefs

3. Irregular linetypes in the drawing.

4. Bad Hcad_Toolbox.dll file eBadLinetypName V53.04

When performing AutoCalc, the following error is displayed.

Unhandled Exception... startIndex cannot be larger than the length of string.
(Parameter 'startIndex').

After clicking the Start AutoCALCs (SAL command) button but BEFORE the AutoCALC Setup window, you get the error; 

Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.

The input string '1◆' was not in a correct format.

Keyboard alias "SAC"

After clicking OK in the AutoCalc Setup window and just before the process begins, you get the following error messages;

Problem updating your Hcad_env.ini file.  /n Will try to rebuild file. /r Pick OK then Restart AutoCALC

Your Hcad_env.ini file is possibly corrupted.  This calc will not continue

Flowing Paths dialog box is empty.