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)

A-Your printer is not correctly configured in the HydraLIST Printer Setup. B-You don't have a printer installed from the Windows Control Panel. C-Your printer isn't online. D-Your printer is jammed or out of paper. E-You tried to print a form to a printer that can accept only text. Runtime Error 482

Nothing happens when you try to process stocklist

When selecting Add Device. You see a load, but Valve Selector does not open.

Revit could not complete the external command...

Revit encountered a BinaryFormatter serialization and deserialization have been removed

When selecting Tag Direction the error. "HydraLIST Tag Setup Errors!" box appears. 

A main label prints in place of the welded line label

When trying to insert a valve type fitting from the parts tree, you get the error; 

Still!!! Block ### is missing.  Please insert manually.

However checking the database for the drawing file shows it exists.

The calculation results shows a pressure requirement which does not show up in the Final Calculation printout

In the example below, 104.344 psi is nowhere in the Calculation Sheets of the printout.