The code
CalibInit(checkboxWidget,hist1D);
that is on a line of its own is not inside any of your methods. The compiler assumes that this is a new method declaration which is probably not what you want.
Side note:
It is not recommended to have methods starting with a upper case character: "Methods should be verbs, in mixed case with the first letter lowercase, with the first letter of each internal word capitalized." from Code Conventions for the Java Programming Language