Issue:
Launching AutoCAD 2026 will produce two errors and fail to successfully open. This behavior occurs after installing updates for Vault Client 2026.
The first error is an “Exception” and points to VaultAutoCAD2026.bundle.

The second error is a Fatal Error with an Unhandled Exception.

Causes:
The problem occurs because Vault Client 2026.4 update is installed but the AutoCAD 2026.1.2 update is not installed. The AutoCAD 2026.1.2 update is required to maintain AutoCAD and Vault functionality.
Solution:
The solution is to download and install AutoCAD 2026.1.2 update.
AutoCAD updates can be downloaded and installed from Autodesk Access, from your Autodesk account at https://manage.autodesk.com, or from the hyperlink below.
Follow the instructions below to download from your Autodesk account.
1. Open a web browser and go to https://manage.autodesk.com.
2. Go to Products and Services.
3. Find AutoCAD and select “View Details.

4. Select 2026 to view updates specific to AutoCAD 2026.
5. Look toward the bottom of the screen to find Autodesk AutoCAD 2026.1.2 Update. Select Download.

6. When the download completes, run the download to install the update.

Follow the prompts to install the update. Once the update is installed, launch AutoCAD 2026 and there should no longer be any errors.
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