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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Khushbu Rajvi. 22,792 Super User 2026 Season 1 on at

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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

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Suresh Kulla 50,280 Super User 2026 Season 1 on at

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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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YUN ZHU 101,948 Super User 2026 Season 1 on at

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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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Nick Webb 911 on at

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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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Nick Webb 911 on at

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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.

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Ramesh Kumar 7,561 Super User 2026 Season 1 on at

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Hi Nick,

As this is the Preview version, it's likely this issue will occur. I suggest logging it on Yammer with BC team.

Thanks

Ramesh

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YUN ZHU 101,948 Super User 2026 Season 1 on at

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Hi, Business Central 2025 wave 1 (BC26) is generally available.

More details: https://yzhums.com/62943/

Please try again in the released version.

Hope this helps.

Thanks.

ZHU

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Nick Webb 911 on at

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I now have a Sandbox running the release version 26:

... and it hasn't changed a thing. It still crashes out as previously described. Once again, I have no error to guide me. Only: 'Something went wrong. An error has occurred'. Where can I look for errors. I had a look in Event viewer. Nothing there of interest.
Other extensions are working fine.

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Khushbu Rajvi. 22,792 Super User 2026 Season 1 on at

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You please try with this new version 26.0.30643.32100

https://learn.microsoft.com/en-us/dynamics365/release-plan/2025wave1/smb/dynamics365-business-central/

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Nick Webb 911 on at

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When I created the Sandbox in the Admin Centre I choose as below:

The resultant Sandbox shows:

and in the BC GUI it shows:

Is this wrong?

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