[Bug]: Extension Fails to Load -- Could Not Load File or Assembly

[dfaivre-pcs]

Description

It had been working for me last week. Running in WSL. Extension no longer loads.

SQLToolsService:

Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002
[Error - 2:10:43 PM] Connection to server got closed. Server will not be restarted.

AzureResourceProvider

Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002
[Info  - 2:06:19 PM] Connection to server got closed. Server will restart.
Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002
[Info  - 2:06:19 PM] Connection to server got closed. Server will restart.
Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002
[Info  - 2:06:19 PM] Connection to server got closed. Server will restart.
Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002
[Info  - 2:06:19 PM] Connection to server got closed. Server will restart.
[Error - 2:06:20 PM] Connection to server got closed. Server will not be restarted.
Failed to load System.Private.CoreLib.dll (error code 0x80070002)
Path: /home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll
Error message: Could not load file or assembly '/home/dfaiv/.vscode-server/extensions/ms-mssql.mssql-1.41.0/sqltoolsservice/5.0.20260316.3/Linux/System.Private.CoreLib.dll'. The system cannot find the file specified.
 (0x80070002)
Failed to create CoreCLR, HRESULT: 0x80070002

mssql:

[2:10:42 PM] [SQL Tools Service] Initializing SQL tools service for the mssql extension.
[2:10:43 PM] [SQL Tools Service] Note: mssql commands will be available after installing the service.
[2:10:43 PM] [SQL Tools Service] 
[2:10:43 PM] [SQL Tools Service] Platform: linux, x86_64, name=ubuntu, version=24.04 (Linux)
[2:10:43 PM] [SQL Tools Service] 

Steps to Reproduce

Not sure???

Affected Area

• Connection dialog (SQL Server | Azure browse/Fabric browse)
• Query editor
• Query results panel
• Object Explorer
• GitHub Copilot integration
• Preview/Edit data
• Table Designer
• Schema Designer
• Schema Compare
• Local SQL Server Container provisioning
• SQL database in Fabric provisioning
• DACPAC/BACPAC export/import
• SQL Database projects
• Query Plan Visualizer
• Other (please describe below)

If you selected "Other", please describe the affected area

Extension just doesn't load...

Environment Information

WSL, VS Code remote on WSL

Confirmation

• I have searched existing issues and couldn't find a match
• I want to work on this issue

[dfaivre-pcs]

NOTE: I had to uninstall Azure Resources extension ALONG with the MS SQL extension to get it to work again.

[aasimkhan30]

we are currently working on a build of extension which has backend bundled in it. This will prevent such first time download error.

#21631

Closing this issue for now.

[dfaivre-pcs]

awesome - thank you! David Faivre

…

On Sun, Mar 22, 2026 at 4:45 PM Aasim Khan ***@***.***> wrote: *aasimkhan30* left a comment (microsoft/vscode-mssql#21707) <#21707 (comment)> we are currently working on a build of extension which has backend bundled in it. This will prevent such first time download error. #21631 <#21631> Closing this issue for now. — Reply to this email directly, view it on GitHub <#21707?email_source=notifications&email_token=AGVW3ATPMLTEY6GPP2LAHE34SBNHLA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIMJQG4YDINJSGAY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4107045201>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGVW3ARMCDRRFSPRSIN7FWT4SBNHLAVCNFSM6AAAAACW24QSWWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DCMBXGA2DKMRQGE> . You are receiving this because you authored the thread.Message ID: ***@***.***>