[Bug] This is an invalid ES System!

**Describe the bug**
Placing down an ES System on a fresh Mohist 1.16.5 server running the Pixelmon Reforged modpack presents me with an error saying the system is invalid.

**To Reproduce**
As said before, Pixelmon Reforged 9.0.0 for MC 1.16.5 on a freshly installed server with the plugin installed, 

**Versions**
MC: 1.16.5
