Subscription cannot be activated at this time.

Step 1a.1 - Error box - missing Pipe Type pointing to Ref 1 & Ref 2

can also be Step 1a.4

Revit could not complete the external command... Revit encountered a Attempt to modify the model outside of transaction

The View button that appears after running a calculation does not do anything

After starting the AutoLIST process, you get an error saying, "Error with Drop/Sprig annotation...  This one will be displayed"

After clicking OK, HydraLIST opens but you won't see any cut lengths of your sprigs and drops in the layer DropSprigTextCL

When starting the AutoCALC process, you get this error;

Could not find fitting match for Pump Only/Test Point Please check!!

You also see an Accessing Database window with a partial green progress bar.

No Operating Heads of Flows Found!!  Please check...

During the install of HydraCAD, you get an error, "Setup Needs the Next Disk, Please insert disk 1 that contains the file data2cab"

When closing a drawing in 3D, and later re-opening and returning to 2D, some of the drawing symbols show up looking like outlines (Hangers, Sprinklers, etc)

When opening HydraCAD, you get the error message saying, "The Ribbon does not have any tabs or panels currently loaded"

HydraCAD Critical Error... Visual Lisp not available