Revit could not complete the external command     System.NullReferenceException

ERROR: No fittings were found on the selected pipe

Command Failure for External Command... System.NullReferenceException

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

After running an Autolist, in HydraLIST and the LINES tab you have a listing tag ID called RM

No error occurs but HydraCAD will not properly load and Hcad commands do not work.  

A quick test is to select the drop menu [File|New], select the template file 'HydraCAD Imperial Default.dwt'.  

The Drawing Setup window should appear but it does not, it loads straight into a blank drawing.

This is what you should see (press F2 to review the text window);

Instead you only see;

HCAD_ADS r4 functions Loaded.

AutoCAD menu utilities loaded.
Requires an integer between 0 and 32767.

3dFitting registry keys found

Requires an integer between 0 and 32767. 
 

When attempting to create a new FSC definition, you get this error message.  Clicking OK closes the command

Drawing Setup dialog doesn't load

No error but when the HydraCAD template is selected, it goes straight to the drawing and command prompt, it doesn't ask for the user to set the scale factor

Unhandled Exception... System.ArgumentOutOfRangeException: Index was out of range

When inserting a flexible sprinkler connection (FSC) after its setup, you get two error messages

Error importing hose over size percent, check your FSC dialog properties

Setting Over Percent to 10%

Error importing hose under size percent, check your FSC dialog properties

Setting Under Percent to 20%

Clicking OK in each window will allow you to continue and insert the FSC detail

When defining a flexible sprinkler connection, the following error is raised ("Input string was not in a correct format"):

No error reported for FSC even when maximum length is clearly exceeded

If you view the FSC properties, it's possible the HoseLength and MaxNumberOfBends values are not set.

When trying to open the dialogue box to define a Flexible Sprinkler connection, the following message box error appears. 

Could not find file; FSC-INSERTDEFLINE.txt

Install error.

Unknown Possible Win7 & InstallSheild conflict Setup Launcher Unicode Dialog Box InstallScript

UCS is out of whack or the clockwise option is checked in units dialog Tagging

HydraCALC for Revit Setup...  Unhandled Exception

Unable to load defaults during HydraCALC Setup. Occasionally will give an error, but most commonly nothing will be filled in. 

After 'finishing area' then exiting out of the Calc Setup screen, no HYD2 (white) reference points are inserted on the drawing Missing Reference Points No Reference Points

Registry entries not getting setup correctly HES is not installed to the C:\ drive Missing the folder; C:\HES\HydraCAD\Ver50\common Partial uninstall of HydraCAD was done Dialog box Startup Acad 2019