Symbol is badly overridden (63)

A class is trying to override a symbol by inheritance, but the overriding symbol and the overriden one do not have the same type.

Here are the rules:

This kind of symbol	can be overriden by...
Dynamic symbol	Dynamic symbol
Static symbol	Static symbol
Read-only property	Read-only property Read-write
Read-write property	Read-write property
Method	Method with the same declaration
Constant	Constant Read-only property Read-write property
Event
Variable	Variable with the same declaration
Extern function	Extern function with the same declaration

All over combinations are forbidden.