No error, but after returning to Revit, no demand info block turns up. 

Error placing reference points or demand area annotation...... System.IndexOutOfRangeException: Index was outside the bounds of the array "Make Pipe Type Info Array String"

1. The info sheet has symbols when it is expecting a number or blank, i.e. "Rack Sprinkler Demand" is N/A instead of blank or 0. Error:Bad Argument 52.02+

Error occurs when using some commands.

Autodesk has released AutoCAD 2025.1.4 & 2026.1.2 updates which breaks HydraCAD. It includes a major programming change by Autodesk that will require a lot of work and a large update by us. That update is being worked on right now, along with a version of HydraCAD for AutoCAD 2027. All are now affected by essentially the same programming change.

BinaryFormatter serialization and deserialization are disabled within this application. See  https://aka.ms/binaryformatter for more information.

Other commands with this error;

Sprinkler Layout dialog (SL command)

Default Dialog Location (DDL command)

When opening Hydracad you get the following 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.

Retrieving the COM class factory for component with

CLSID {44D62FAE-67A7-4131-BF38-489CDFE44738}

failed due to the following error: 80070424 The specified

service does not exist as an installed service. (Exception

from HRESULT: 0x80070424).

Server Replied:
No matching serial number was found in the database

Server Replied:

BAD;32503680000

Server Replied:

“An error has occurred and the activation could not be completed. Please contact customer support for further information.” 

Call from AutoList::AddLineItemsToDatabase DAO Error changes requested to table not successful - create duplicate values in the index, primary key.... The line it failed to write is logged in C:\HES\TEMP\DAOUpdateError.txt Also: DAO Server Error RSU Update Call from Autolist DAO Error

Error Finding Hanger Information when generating 3D Hangers

Create 3D Hangers command did not created 3D hangers for the #01B hanger assembly but it did for all other hanger assembly types. #01B 3D hanger information is not in the DAT file. HydraCAD v50

When running a calculation, the value for "pressure required" shows a negative value.

When trying to add reference points, none are added and this error shows:

Revit could not complete the external command... Object Reference not set to an instance of an object.

When printing final, your outside hose demand after the pump isn't included in the total flow.

In the example above, the system demand is 1274 gpm is represented by point D2/D3.  The outside hose adds up to another 250 gpm but there isn't another marker at 1524 gpm

*Please note, while the Demand summary at the top shows D3 as a point, since D2 and D3 are the same value, the graph will only show point D2.

When opening HydraCAD, you get this error

Unhandled Exception...DAO32Server...

HydraLIST ribbon is missing in the Revit toolbar when opening a project file.

When opening Hydracad you get the following 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.

Retrieving the COM class factory for component with CLSID

{44D62FAE-67A7-4131-BF38-489CDFE44738} failed due to the

following error: 80070005 Access is denied. (Exception from

HRESULT: 0x80070005 (E_ACCESSDENIED)).

Bad update. These Files are missing system folder dependencies of HydexVB64 or HydexVB3: MFC100u.dll MSVCR100.dll MSVCP100.dll Because of this, no pass can be given nor does security work on any product. (64-bit products may work while 32-bit products don't or vice versa) Opening

When trying to add reference points, none are added and this error shows:

When trying to insert a Hydraulic demand block (Compact/Standard/Expanded) (IHD command) and after selecting the .WXF file to use;

You get the error message;

Error: bad argument type: numberp: DATAFILE

And the command kicks you out.

When re-opening a calc file generated by Hcad for Revit, you get a Runtime-error 62, Input past end of file

Followed by an 'error during load_data' message.

NOTE:  After clicking OK, the job will open to blank data.  Close the file.

DO NOT CLICK 'YES' TO SAVE YOUR DATA otherwise you will lose all your data and there is no way to recover it.