No error... but the view shows up in the project browser but quickly disappears after and cannot be accessed. 

When opening HydraCAD, you only receive this error message and not a HydraKEY error with the golden X.  If you receive a HydraKEY error, search for the linked HydraCARD in that message box as it takes priority.

Security Error:  One of the following conditions is likely;

HydraCAD is unable to function under these conditions

• Lock database needs updating in HydraKEY
• Accounting flag on your account
• Hardware lock not plugged in
• Extra ACAD.RX file found in folder in Support File Search Path
• Sentinel driver is missing
• InstallPath registry item set to wrong drive

After AutoCAD opens, press F2 to view the command prompt, see if the text below appears.  If yes, see solution 1.

Could not find file HCAD_ENV.INI

Is 2024; error: no function definition: PRINTEM

Keyboard alias "BS"

Bayspace preview is not lining up the sprinklers evenly.  Or Bayspace stops working with a "Bad Argument Type 2D/3D point error." message.

Revit could not complete the external command... System.ArgumentException

After buiding your 3D risers, raising to 3D, exporting to a Persistent Model and Navisworks successfully, your 3D riser is missing, with the exception of the skipoles

Your layers are on and the 3D_DETAIL layer is present, unlocked, thawed and visible, you just can't see the pipe and fittings.  The one customer reporting this said they disappear if the drawing is closed then re-opened.  They'll be visible in viewports as well, just not in 2D view.

See this related HydraCARD also;  https://hydracards.hydratecinc.com/cards/card-1144

Command failure for external command ... System.IO.FileNotFoundException ... File name 'AWSSDK'

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. 
 

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

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.

layer override set up for this viewport or layer is frozen in "viewport freeze" Layers not displaying

In a paper space viewport, certain blocks or dimensions do not appear, even though the layer is ON and set to Plot in Current Viewport

It may appear as if the layer is not showing up, but it is really certain items in the layer

While multiple PDFs are being opened in the PDF viewer, HydraHEADS displays a message box; "There were 'x' PDFs for this sprinkler...". The user clicked OK on the dialog box before the PDF viewer had a chance to open *ALL* the PDFs. Runtime Error dialog box 50.21.4

Viewport created in frozen of off layer Viewports

When trying to run a calc for the system, this error appears: 

User created two viewports in a layout tab of a 3D pipe drawn in the 3d_details layer.  One of the viewports plotted fine but the other didn't show the pipe at all.

AutoCAD view of viewports, note the selected pipe is the same in both drawings;

Post plot, PDF View; note all of the 3D Details pipe is missing from the right viewport

Custom View seems to be the problem.

weird characters in autocalc summary 1?#0 view summary fonts

When plotting two viewports, one with center-to-center lengths, and the other with cut lenghts, the riser nipples/vertical pipes will show both, even if your layout tab looks fine.

LAYOUT TAB

PLOT PREVIEW

When viewing your Persistent Model drawing, you see the clamshells/Pacman/bracket for the riser nipples/vertial pipes