When attempting to convert an existing polyline to the Remote Area polyline, you get the following error when selecting a pline. Error: Automation Error. Key not found Command:

Area # section is blank or missing remote areas in the AutoCalc Setup dialog box. Area number is not recognized

Edit Remote Area dialog box is cut off (Can also happen to the main HydraCALC for Revit Setup dialog box)

Machine is set up to generate old-style (pre-AutoCAD 14) polylines. Flowing Heads Remote Area

Command Failure for External Command... Object reference not set to an instance of an object

Step 1a.1 - You may be missing a selected pipe type from master.dat or no pipe type has been selected for a particular system component

When attempting to setup a sprinkler head, after clicking OK in the definition window, the command prompt looks like this and no sprinkler head is inserted;

One or more toolbars cannot be found after selecting a menu or command.

This happens because the toolbar is being opened 'off screen'. This usually happens when the computer has a dual monitor but the 2nd monitor isn't currently connected. 

Printing a calc shows this error in HydraVIEW;

File not found Runtime Error 53

When selecting Adjustable Ring Hangers for pipe sizes larger than 8" the detail does not show.

Run-time error 3051... The Microsoft Jet database engine cannot open the file

Can happen when opening HydraLIST or Head Selector

50.00.14+

Blacked out cells in Head Selector dialog

After opening AutoCAD and a drawing, you have a dead area where you can't draw nor does anything display.  Usually next to a compressed palette.  Note in the image below how the crosshairs do not extend to this area.

Pop-up immediately after selecting RTS Points

The location that your document is saved in cannot be used. Please select that folder that you would like RTS data saved to,

When trying to insert a Sprinkler Head Schedule (SHS command), after viewing the setup dialog box, then selecting sprinkler heads, when asked to select a location for the guide, you get the error;

Please pick start point for schedule

Error: bad argument value: non-negative: -1

Error placing Reference Points or Demand Area annotation.: System NullReferenceException: Object reference not set to an instance of an object. nodes reference finish

Valve selector unable to open in Revit Beta Ver 25.1.003

No error, but when trying to connect a sprinkler to a pipe, connect head does not let you select a sprinkler