#638 Webapp debug problem

I have a problem in so far as I cannot get IDEA 638 even to start Tomcat
running.

If I attempt to debug a JSP in a webapp enabled project I get this error:

"Could not find the main class. Program will exit"

In the console window I get:

java.lang.NoClassDefFoundError: Tomcat
Exception in thread "main"

So what might I be doing wrong?

JDL

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