Java UnsupportedClassVersionError: Fixing 'com/mohistmc/MohistMCStart' Compilation Mismatch

This error message typically appears when there is a version mismatch between the Java Runtime Environment (JRE) and the Java Development Kit (JDK) used to compile the code.

In this specific case, the error message indicates that the MohistMCStart class has been compiled using JDK version 17 (class file version 61.0), but the JRE being used to run the program only recognizes class file versions up to JDK 8 (version 52.0).

To resolve this issue, you need to update your JRE to a version that supports the JDK version used to compile the code. Alternatively, you could recompile the code using a lower version of the JDK that is compatible with the JRE being used to run the program.