'orgorg.springframework.web.servlet.DispatcherServlet'is not assignable to ''java.servlet.Servlet,

This error typically occurs when attempting to define a Spring MVC DispatcherServlet in a web.xml file.

The issue is that the DispatcherServlet class does not implement the javax.servlet.Servlet interface, which is required in order for the servlet container to properly load and handle the servlet.

To fix this error, you can define the DispatcherServlet using Spring's Java-based configuration instead of using a web.xml file. This involves creating a configuration class that extends the AbstractAnnotationConfigDispatcherServletInitializer class and overrides its methods to configure the servlet.

Alternatively, you can use a different servlet class that implements the javax.servlet.Servlet interface, such as the HttpServlet class, which serves as a base class for HTTP servlets in Java Servlet API.

Overall, it's important to ensure that any servlets defined in a web.xml file or elsewhere in your application implement the required interfaces and are compatible with the servlet container being used.