Hello this is urgent. Someone to look into this Exception problem when you try to do anything and even down to just wanting to access the Transform!
No details about used Grafana version (so this isn’t good issue report). Blind guess - it is 7.0.2. Issue is already fixed in 7.0.3. I would recommend to read release notes - https://github.com/grafana/grafana/releases - it is valuable source of fixed issues:
If you still see this after upgrading to 7.0.3, please file a bug report. Transformations are still a beta feature.