When running AUDIT command, you get an error message "AcDbLayerTable could not be repaired" message

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 starting the AutoCALC process, you get the error; Unhandled exception has occurred in a componenet in your application

eOnLockedLayer

After running the AutoCALC process on a long grid system, you realize some of the gridlines in the middle didn't get picked up.

Runtime Error 6 when Attaching Fittings

Fitting is a RED. COUPLING @ node DAB0C connected to pipes D9FE8 :D9FE2.

Trying to run a auto calc from a drawing.  How do I find the referenced pipes?

Just after starting the Autocalc Settings, the dialog box as shown below pops up and the process stops.  

Something went wrong!  Error Code J19380

AutoCALC is creating extra node points where there shouldn't be.  In the image below, node 45 shouldn't be created as there's neither a flowing head nor a change in diameter at that point.

'extra node'

'extra ref point'

'extra reference point'

'refpt'

Caclulating Total Lengths...

Runtime Error "13"

Type mis-match

When using the Figure Head Area tool, you get this error

Error during APQ insert - Microsoft VisualBasic ErrObject

Error during LoadAPQFile - eFileNotFound

Error during InsertAPQandTEXT

File name asked for does NOT exist

FitExch.dat 1.a.1