Community

I am a PC Technician at a high school that uses TextPad for a Java programming class. We recently re-imaged the school, and all software had to be re-installed. When the students/teacher compiles the code they have written, it compiles. When they then try to run the program they have installed, (Ctrl+2) an error says "Exception found in thread "main" Java.Lang.NoClassDelFoundError"

Does anyone know what I might do to fix this?