compiler select an profusion between interface exception

trying an excpetion category yield plcae anxiety xml parsing, found an engaging function - compiler select between profusion consumes an interface needs system.exception i perplexing pass xmlreader parameter.

detais following:

//exception overloads:
public filterxmlparseexception(string message, difference innerexception)
        : base(message, innerexception) { }
public filterxmlparseexception(string message, ixmllineinfo lineinfo) {...}

//usage:
xmlreader reader = ...
ixmllineinfo lineinfo = (ixmllineinfo)reader;

//fails
throw new filterxmlparseexception("<filter> component expected", reader);

//ok
throw new filterxmlparseexception("<filter> component expected", lineinfo);

and fails given name repremand overload.but why? xmlreader supports an interface hereditary system.exception