Error: An empty string is not a valid name.

Today I started receiving a weird error when opening an assembly from 3DExperience, which used to open without issues: "An empty string " is not a valid name". See the screenshot below.

Has anyone ever had such a problem?

Versions:

  • SolidWorks 2025 SP2.0
  • Design with SolidWorks Hotfix 2.2
  • 3DExperience 2025 FD02

Steps to reproduce:

  1. Search for an item using the 3DExperience sidebar inside SolidWorks.
  2. Right click and click Open.

Expected result:

  • Assembly opens normally.

Real result:

  • "An empty string " is not a valid name" error. Assembly does not open. Instead, only one of the children of the assembly opens.

What I already tried:

  • Restarting and clearing cache.