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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(217.60000000000002, 49%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EE%3C/text%3E%3C/svg%3E)
I updated Azure Functions Core Tools to version 4.0.6543 this morning and when I tried to run my app service function locally in Visual Studio Code I got the following error...
Could not load file or assembly 'Microsoft.AspNetCore.Authentication.JwtBearer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
I had to reinstall a previous version to get things working again.
Please advise
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(25.6, 66%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETS%3C/text%3E%3C/svg%3E)
which version did you install? please describe a bit more in detail how you managed to fix it in the meantime. ran in to the same issue unfortunately....
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 12%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJK%3C/text%3E%3C/svg%3E)
Similar issue and a downgrade (4.0.6280) fixed it, my output:
Azure Functions Core Tools
Core Tools Version: 4.0.6543 Commit hash: N/A +a4bf0e412b43c659740d8db346fc44d6cdd62e45 (64-bit)
Function Runtime Version: 4.1036.1.23224
Found xxx/.csproj. Using for user secrets file configuration.
Could not load file or assembly 'Microsoft.AspNetCore.Authentication.JwtBearer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
I noticed by default the pre-release is installed as 4.0.6543 is not yet 'released'.
To answer Terrence Stella's question,
The error occurred after installing version 4.0.6543.
To get things working again, I uninstalled version 4.0.6543 and reinstalled version 4.0.6280.
I used the msi package for both installations.
For further verification I tried installing the newer version again and verified that the file, "Microsoft.AspNetCore.Authentication.JwtBearer.dll" was missing in "C:\Program Files\Microsoft\Azure Functions Core Tools". After reinstalling the older version, the file IS there.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(32, 82%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMJ%3C/text%3E%3C/svg%3E)
Same issue as well
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 36%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFV%3C/text%3E%3C/svg%3E)
I have the same error with version 4.0.6821
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(265.6, 70%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
same issue here also, updated to latest stable 4.0.6543 and for the same error. downgrade to 6280 did not work, a full removal of 4.0.6543 and installed 4.0.6543 via winget seemed to fix.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 67%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERG%3C/text%3E%3C/svg%3E)
same issue here after upgrading to 6821