Check out the actual .java file that the App Server creates and see if you can follow the error messages better.
According to the error message,
you should be able to find the .java file here:
D:\WebSphere\AppServer\temp\node\server1\App\App.war\_errorreport.java
Also, if you enclose your code in
UBB [CODE] tags it will preserve all the whitespace and stuff
If you can't figure out the error message after looking at the .java file -- try stripping down your JSP -- that might help you figure things out. Or try posting it here, maybe we'll be able to spot the error.
Good luck!