When starting the AutoCALC process, you get the error Unhandled exception has occurred in a component of your application

Key cannot be null

Parameter name: key.

Expanding DETAILS shows this information;

Application does not support just-in-time (JIT)
debugging. See the end of this message for details.

************** Exception Text **************
System.ArgumentNullException: Key cannot be null.
Parameter name: key
   at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)
   at HCAD_HUI_CALC.CalcClass_Utilities.GetNodesOfPipesThatAreVertical(String FitID, Calc_File myCalcFile)
   at CalcingNameSpace.AutoCalcForm.MakeCalcFiledataPart1(Database db, Calc_File& MyCalcFile)
   at CalcingNameSpace.AutoCalcForm.SetupCalcFile()

Step 9a.1 - Runtime Error 62 Input past end of file.

Step 9a.1 - Saving Raw Calc Data Auto- Program Load Error Could not initiate process called for by \Hes\HydraCalc\Ver50\Programs\Hyd_Prog.exe

Unhandled exception: Length cannot be zero

No message, but grid does not get set up with L and R markers, even though a grid. Pipe mislabled as to Input Type

Autopeak peaking hydracalc

Step 1A.1 - Runtime error 13 type mismatch

File name asked for does NOT exist

FitExch.dat 1A.1

Step 1a.10 - "Attaching Node 2 Elevations" User ID Duplicated Dwg ID Dup for User ID

Duplicated hydraulic ref points

Drawing seems fine with no errors but opens to a blank HydraCALC screen

Water supply test point not connected to a pipe. Reinsert water supply\test point