How far do we go from here - pen thickness

I keep getting 4 errors on the sketchpad code for the pen thickness level. What advice do you have as how to fix this.

Repl link:

code snippet

Please share a link to your repl where the error appears. This way it will be easier for the community to help you solve your problem.

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https://replit.com/@Fay13/Day-9-How-Far-Can-You-Go-from-here#src/sketchpad/SketchPad.java

https://replit.com/@Fay13/Day-9-How-Far-Can-You-Go-from-here