Symbolic tool error

[Xeyos]

Hi I have this small piece of code that gives me an error that I can not
solve: 
code:
 x = sym("x");
 y = sym("y");
 f = m*x+q-y;
 g =((x-E2)^2)+((y-N2)^2)-((type(4))^2);
 a = symfsolve(f,g);

m,q,E2,N2,type(4) are constant.

Errors:
error: can't perform indexing operations for ex type
erorr: evaluating argument list element number 1
erorr: evaluating argument list element number 2




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