Cannot initialize JavaFX:java.lang.UnsupportedClassVersionError

[Yuqing-9]

This problem occurs when I run IJP color calculator/calibrator in Fiji. How should I solve it?

[Yuqing-9]

My system is MacOS

[jpsacha]

You need Java 11 or newer to use IJ Plugins.
You way want use the instructions on to https://github.com/ij-plugins/ijp-imagej-launcher how to do it on Mac.