Zoom SSO Error Can't Join meeting

[rjgreen1029]

Hi! 

I've been having some issues with zoom when I try to log in via SSO and join a meeting  - "The Code Execution cannot proceed because UIBase.dll was not found. Reinstalling the program may fix this problem" I get the same error for CMMlib.dll, Duilib.dll, and MSAALib.dll. I have tried using Clean zoom to uninstall and reinstall zoom, used the MSI installer, and also can see all of these files in the zoom folder, so they definitely exist. Any advice much appreciated! 

[MGSR]

Hello @rjgreen1029,

Welcome to the Zoom Community! We're glad to have you here.

The error message you’re seeing (“The Code Execution cannot proceed because UIBase.dll was not found” and similar DLL errors) typically points to a problem with how Zoom is interacting with your Windows system files, even if the DLLs are present in the Zoom folder. Here are some steps you can try to resolve this issue:

1. Ensure All Windows Updates Are Installed
   Outdated Windows components can cause DLL errors. Go to Settings > Update & Security > Windows Update and install any pending updates. Restart your computer after updating.

2. Run Zoom as Administrator
   Right-click the Zoom shortcut and select “Run as administrator.” This can help if there are permission issues accessing DLL files.

3. Check for Antivirus or Security Software Interference
   Some security software may block or quarantine DLL files. Temporarily disable your antivirus and try launching Zoom. If it works, add Zoom as an exception in your antivirus settings.

4. Reinstall Microsoft Visual C++ Redistributables
   Zoom relies on certain Microsoft Visual C++ Redistributable packages. Download and install the latest supported versions for both x86 and x64 from the Microsoft website.

5. Remove All Zoom Files Before Reinstalling
   Even after using CleanZoom, some files may remain.

• Uninstall Zoom.
• Delete the following folders if they exist:
  • C:\Users[YourUsername]\AppData\Roaming\Zoom
  • C:\Users[YourUsername]\AppData\Local\Zoom
• Restart your computer.
• Download the latest Zoom client from https://zoom.us/download and reinstall.

6. Try Installing Zoom in a Different Directory
   During installation, choose a different folder (not the default) to see if the issue persists.

7. Check System File Integrity
   Open Command Prompt as administrator and run:
   sfc /scannow
   This will scan and repair any corrupted Windows system files.

If you’ve tried all these steps and the issue continues, it may be related to deeper system-level problems or group policy restrictions (especially on managed devices). In that case, contacting your IT department or Zoom support with detailed logs would be the next step.

[MGSR]

Hi @rjgreen1029!

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Have a great day!