Unless installed as a package and properly imported, files for classes used in the program (in this case EasyReader.java or EasyReader.class) should be available in the same folder as Hello.java. A cannot resolve class error may also show up when a library class is not imported or when data type is incorrect or misspelled.
This error may occur when a method is called incorrectly: either its name is misspelled (or upper-lower case is misplaced), or a method is called with wrong types of arguments, or a method is called for a wrong type of object or a wrong class.
A very common error, cannot resolve symbol may result from an undeclared variable or a misspelled local variable or field name, or missing parentheses in a method call.
Taken from here: