Export physics3 tickbox greyed out

When I try to export I cannot pick the option to export physics3.json which is causing problems as my models wont move right. Is there something I can do so that this option will appear again? Thanks in advance.

System info in case it is relevant:
- Live2D Software Version: Cubism Editor 4.1.05
- OS & Version: Windows 10
- PC Model: Chuwi Corebox-X
- Graphics Specifications: Intel Iris Graphics 540
- CPU: Intel Core i7-6560U
- Memory: 8GB
- Illustration Software used: Krita via Photoshop
- (Attached screenshot)

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