Rejecting re-init on previously-failed class java.lang.Class: java.lang.NoClassDefFoundError

Question

I see an information log in my console that looks like an error. It is printed from \"art\", which is generally associated to memory but I need help understanding what it me

Answer 1

In my case, I was having errors in design view. I overlooked those errors and ran the program, I got above exceptions.

However, When I went to design view. I saw a red error symbol at right top. I clicked at the symbol and got error details.

Error details could be different for you, but for me column index of one button was out of the range of grid column number.

I re-ran after fixing those errors. Worked for me.