The identifier "XXX" in C # is not CLS-compliant

The identifier "XXX" is not CLS-compliant, meaning that as long as there is no interface with the outside, such as in private functions, but with some non-CLS-compliant types,
But if it is public, it must conform to this norm.

The workaround is to change the fields of these public types in this class to the attribute form (get,set form) and call the class externally to access it as an attribute.

Reference articles

What does it mean that there are data types in C # that are not CLS-compliant (Common language specification)?

The identifier "XXX" in C # is not CLS-compliant