New to Java

Hi i try to build a dynamic web project in eclipse europa version.so i have opned my eclipse editor then right click selected the dynamic web project.onceit is done i wated to add the servelt so i have selcted the sevlet pressed ok then given name for it,next create servlet here iam getting the error lke this

"An error occured when create servlet is finished" and in deatils it displyainf like thi

"java.lang.Error: Unresolved compilation problems:
The import org.eclipse.jst.j2ee.internal cannot be resolved
CreateServletTemplateModel cannot be resolved to a type
CreateServletTemplateModel cannot be resolved to a type

at org.eclipse.jst.j2ee.web.ServletTemplate.<init>(ServletTemplate.java:3)"

can any one help me here i have been stuck from morning doing nothing try to solve this problem

thank u in advance

vijay