When starting AutoCALC, it stops in the v50 Fuel Gauge at step 1a.4 - Calculating Total Lengths. 

Working on the pipe from node #### to node #### with a fitting string of ...

May be followed by a Runtime Error 13 or Runtime Error 5

Your first step of troubleshooting should be to track down the coordinates of the handles (the 4 to 6 character hex code noted after the word node, or pipe, or fitting.  Search for the command FINDME to get these coordinates.

When starting AutoCALC the v50 Fuel Gauge stops at step 1a.4 plus you get a Run-time error 6; Overflow 

Working on pipe from Node ### to Node ### with a fitting of "?" and a diameter of / pipe type of 0.5 / SCHED-40 where the pipe id = ### 

The "####" values represent handles.  It is recommended you use the FINDME tool to find the coordinates of the handles, this will help narrow down the cause of the error.

May also see a Runtime Error 5, "invalid procedure"

Calc process stops at step 1a.4 and Runtime Error 5 displays

When trying to open Add Device, nothing happens and Revit just hangs up / appears frozen.

No error, but after clicking Setup, Revit freezes / stops working, and nothing else is able to be selected.

Calculation stops at Step 1a.4 - calcing total lengths

Can be accompanied with a "Runtime error 5 - invalid procedure call or argument" or "Runtime error 6 - overflow"

Upon calculating a file, the error message, "Failed to launch C:\HES\Hydratec for revit\programs\calcdiagnose.exe" pops up.

Was preceeded by these messages;

Plus this;  Number of Loops -1 and or Nodes with undesignated elevations

This job has gone 200 or more passes without balancing.

Calc stops at step 2.2a, also creates Run-time error 5

Calc stops at Step 2.3 (Can also show Run-time error 62)

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.

Calc loading bar stops completely at step 1a.9

Primary calc results are shown, and when selecting OK to continue back to the calc input screen, the two messages below are displayed, twice;

"The designated source node was not found in the list of pipes" OK

"Calculation failed for an unknown reason" OK

Process Error Hydcalc

When opening HydraCAD, you get this error message or something similar;

AutoCAD Warning

The following shortcuts in the search were invalid and ignored: 

After clicking OK, HydraCAD will open up, albeit very slowly, and almost every step will take an significant amount of time, for example 45 seconds to start a new drawing or to size a pipe

Failure at Step 5a.3b

No error, tagged main gets listed as a different ID example: Main D has missing pieces which appear as Main C SEARCH WORDS: missing skip not listed wrong n/a

Sprinkler heads not defined in the drawing or no 3D block assigned for a sprinkler head. Going to Navis only - corrupt Persistent Model drawing? eKeyNotFound Dialog box HydraCAD

Sprinkler heads not defined in the drawing or no 3D block assigned for a sprinkler head. Going to Navis only - corrupt Persistent Model drawing? eKeyNotFound Dialog box HydraCAD

The CURRENT LAYER in the drawing is LOCKED. Show System Model process stops on Step 13 of 28 while adding RN Fittings to the drawing. Picking the 2D Switch to Edit Mode button removes the Hydrapipes and the riser nipples. Show System Model HydraCAD V51

Upon starting the Checkup command for AutoCalc, the command starts but stops. The Command Prompt says; "Initializing... Checking to make sure heads are in the right layer...bad argument type: stringp nil" As a side note, the user's drawing had multiple repeat head definition boxes (blue boxes in ACC1 layer). These were cleaned up (deleted) and the heads redefined. The AUDIT command was run after the cleanup