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26.0.30643.32477 (Preview) - error CS0102

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Posted on by Nick Webb

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I'm testing one of my extensions on a Sandbox running version: 26.0.30643.32477 (Preview) and when I select 'Publish without debugging' the lines below are displayed in the Console of the code editor:

[2025-04-02 15:55:28.41] Error: C# compilation has failed for the application object CodeUnit_50024.
The failing c# file name is E2304FBC7C4AFA5538E1C81DFB4C48646798BDFD6531E806B1CD1E962A28035F.cs. You can find this file with the associated AL file saved in the C:\ProgramData\Microsoft\Microsoft Dynamics NAV\260\Server\MicrosoftDynamicsNavServer$MS\apps\compilationerrors folder.
Detailed compilation error: C:\ProgramData\Microsoft\Microsoft Dynamics NAV\260\Server\MicrosoftDynamicsNavServer$MS\apps\metadata\3\E2304FBC7C4AFA5538E1C81DFB4C48646798BDFD6531E806B1CD1E962A28035F.cs(561,40): error CS0102: The type 'Codeunit50024' already contains a definition for 'ProcessDateRange_TextConst_βconst'
C:\ProgramData\Microsoft\Microsoft Dynamics NAV\260\Server\MicrosoftDynamicsNavServer$MS\apps\metadata\3\E2304FBC7C4AFA5538E1C81DFB4C48646798BDFD6531E806B1CD1E962A28035F.cs(562,40): error CS0102: The type 'Codeunit50024' already contains a definition for 'ProcessDateRange_TextConst_βconst'

When I test the process and it gets to the line where it calls the DateRangeProcessor codeunit (mentioned above), I get a 'Something went wrong' web-page.

What's causing this?

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Dynamics 365 Business Central

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Nick Webb 754 on at

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26.0.30643.32477 (Preview) - error CS0102

Just to add, I've dealt with all the warnings and the extension is now compiling with no warnings or errors, but it hasn't changed a thing. It still crashes out as previously described.
Nick Webb 754 on at

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26.0.30643.32477 (Preview) - error CS0102

Thanks all for responses.

1. Re: Khushbu Rajvi's point: There are no multiple declarations of any text constants in the code.
2. Re: Suresh Kulla's point: I pointed the app to version 26 and built it successfully. A few warnings, but no errors.

3. Re: YUN ZHU's point: I now have version 15.0.1410565 installed (see below). I'm not getting the CS0102 error any more but it gets to the line below where it calls a procedure in a codeunit in the extension (DateRangeProcessor) and aborts as it calls the procedure with no error reported in the code-editor. It doesn't even get to the first line in the procedure. In the browser: 'Something went wrong. An error has occurred'. No actual error is reported. I have nothing to go on?

cuDRP: Codeunit DateRangeProcessor;

txtEditedDesc := cuDRP.ProcessDateRange(txtDesc, txtRecurrence);

Here are the compiler warnings:

c:\Source\VSCode\AL_R&D\RecurringInvoices_20_PreRelease\Cod50023PurchInvReplicator.al(87,26): warning AL0432: Codeunit 'NoSeriesManagement' is marked for removal. Reason: Please use the "No. Series" and "No. Series - Batch" codeunits instead. Tag: 24.0.
c:\Source\VSCode\AL_R&D\RecurringInvoices_20_PreRelease\Cod50021InvoiceReplicator.al(426,26): warning AL0432: Codeunit 'NoSeriesManagement' is marked for removal. Reason: Please use the "No. Series" and "No. Series - Batch" codeunits instead. Tag: 24.0.
c:\Source\VSCode\AL_R&D\RecurringInvoices_20_PreRelease\Qry50021_APIPostedSalesInvoice.al(160,41): warning AL0432: Field 'Package Tracking No.' is marked for removal. Reason: Field length will be increased to 50.. Tag: 24.0.
c:\Source\VSCode\AL_R&D\RecurringInvoices_20_PreRelease\Cod50023PurchInvReplicator.al(91,31): warning AL0432: Method 'GetNextNo' is marked for removal. Reason: Please use method GetNextNo(Code[20]; Date) or PeekNextNo(Code[20]; UsageDate) in the codeunit "No. Series" or "No. Series - Batch" instead. GetNextNo(Code[20]; Date; Boolean) does not have the same behavior. Make sure to use the correct parameters.. Tag: 24.0.
c:\Source\VSCode\AL_R&D\RecurringInvoices_20_PreRelease\Cod50021InvoiceReplicator.al(430,31): warning AL0432: Method 'GetNextNo' is marked for removal. Reason: Please use method GetNextNo(Code[20]; Date) or PeekNextNo(Code[20]; UsageDate) in the codeunit "No. Series" or "No. Series - Batch" instead. GetNextNo(Code[20]; Date; Boolean) does not have the same behavior. Make sure to use the correct parameters.. Tag: 24.0.
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YUN ZHU 80,020 Super User 2025 Season 1 on at

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26.0.30643.32477 (Preview) - error CS0102

It should be a problem with the AL Language version. Please try again after updating to the released version.

Thanks.

ZHU
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Suresh Kulla 46,338 on at

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26.0.30643.32477 (Preview) - error CS0102

There are some changes in version 26, previously those are warnings but now they are Errors, if you have the variable name in Table and Page it throws an error, that is just an example. Try to point your app to version 26 and build it, it should show you all the errors in vscode which you need to fix before publishing them.
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Khushbu Rajvi. 12,470 Super User 2025 Season 1 on at

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26.0.30643.32477 (Preview) - error CS0102

The error CS0102 indicates a duplicate declaration of ProcessDateRange_TextConst_βconst in Codeunit50024. Check for multiple declarations of the text constant, remove any duplicates, and clear cached compilation errors from C:\ProgramData\Microsoft\Microsoft Dynamics NAV\260\Server\MicrosoftDynamicsNavServer$MS\apps\compilationerrors. Restart the BC server, recompile, and republish. If the issue persists, it may be a bug in the Preview version—test on a stable release