Why I get a syntax error on desolve

[Anthony The Koala]

Dear roadrunner,
Thank you for the reply.

When I was in the home screen pressing the "house" button on the left I originally got:

desolve(4*y''-6*y'+7*y=0)

But now when I am in home screen I get Syntax Error.

How do I go back to home screen without getting a syntax error OR the additional CAS.EVAL statement as in:

CAS(EVAL("desolve(4*y''-6*y'+7*y=0,x,y)"))

Thank you
Anthony, Sydney