Manuel BM 

The error message "Value cannot be null. Parameter name: uri" indicates that somewhere in the program, a null value is being passed to a method or function that expects a non-null URI (Uniform Resource Identifier) value. A URI is a string that identifies a resource, like a web address or a file path.

In order to help troubleshoot the issue, it would be helpful if you could provide more information about the specific context in which the error occurs.  Here are some questions that could provide helpful information:

1. **When does the error occur?** - Can you describe the specific actions that trigger the error? For instance, does it happen when you're opening a project, saving a file, using a specific feature, etc.?

2. **Consistency of the error** - Does this error always happen with the same actions or does it occur randomly? Does it happen with every project or just specific ones?

3. **Environment details** - Could you provide information about your system, such as the operating system and its version? Do you have any other relevant software installed that could potentially conflict with Trados Studio?

4. **Project and file details** - Are you working with local files or are they located on a network drive? Are you using any specific Translation Memories or Termbases? Are there any unusual characters in your file paths or names?

5. **Error Details** - If there is a detailed error message (an error stack) or an error log, could you provide it? That might contain important information about what part of the program is triggering the error.

6. **Recent Changes** - Have you recently made any changes to your system or to Trados Studio itself? For instance, did you install updates, new software, or modify settings?

The answers to these questions could help narrow down the issue, and give a clearer direction towards a solution.