How to find the line of code that is causing the error?

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Posted on by Michael Antony

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Hi friends, my name is Antony.

I recently encountered an error when I posted a Job Card on a Production Order.
The error says:
Unable to cast object of type 'Dynamics.AX.Application.ProdRouteJob' to type 'Dynamics.AX.Application.ProdJournalBOM'.

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I've tried to debug this line of code by putting a breakpoint on the class that runs on Post Button and also attaching the process to w3wp.exe.

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Then the error appears in output window, but I don't know how to find out which method/class/line is causing the error.
Is this method of debugging is correct? How do I find the line/method that is causing the error?

Any suggestions will be very helpful. Thank you.

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Michael Antony 314 on at

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RE: How to find the line of code that is causing the error?

Hi Martin. Thanks for your advice.

I accidentally found the error when I checked the ProdRouteJob extension class. In the event handler method I incorrectly declared a variable that should be ProdRouteJob instead ProdJournalBOM which caused the error.

But I'll try and learn your suggested approach to dealing with this kind of error.

Regards,

Antony
Michael Antony 314 on at

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RE: How to find the line of code that is causing the error?

Hi Nikolaos. Thank you for your advice.
I've tried putting a breakpoint in Classes\Info\add but the call stack doesn't show up when this error occurs.

Regards,
Antony
Martin Dráb 232,996 Most Valuable Professional on at

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RE: How to find the line of code that is causing the error?

I don't think that Info.add() is called for managed exceptions like this. At least it didn't work for me the last time when I tried it.
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nmaenpaa 101,158 Moderator on at

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RE: How to find the line of code that is causing the error?

In addition to Martin's suggestion, a general good approach is to put a breakpoint in Classes\Info\add, this way you can always find out the call stack of any process that prints in the infolog. Including your current exception.
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Martin Dráb 232,996 Most Valuable Professional on at

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RE: How to find the line of code that is causing the error?

A fast way of finding the place may be configuring Visual Studio to break on InvalidCastException.

Go to Debug > Windows > Exception Settings, search for InvalidCastException and tick System.InvalidCastException in the list of Common Language Runtime Exceptions. Then attach the debugger and try the process again. The debugger should stop at the place where the exception is thrown.
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André Arnaud de Cal... 294,261 Super User 2025 Season 1 on at

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RE: How to find the line of code that is causing the error in AX365?

Hi Michael,

What is the version of your Dynamics 365 application? Do you have customizations? If so verify if this could be causing it.

If you don't have customizations, you can search on LCS issue search for known issues. I couldn't find this specific error, but some other which were identical on other application areas. It might be a bug if you don't have customizations yourself. In that case, contact Microsoft Support.
Ludwig Reinhard Microsoft Employee on at

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RE: How to find the line of code that is causing the error in AX365?

moved to the d365 forum