There are No resources that can be added or removed from the server

For this you need to update your Project Facets setting.

Project (right click) -> Properties -> Project Facets from left navigation.

If it is not open...click on the link, Check the Dynamic Web Module Check Box and select the respective version (Probably 2.4). Click on Apply Button and then Click on OK.

Check whether your Java version is compatible with the project. Right click the project>>Properties>>Project Facets>>Java check the version is compatible with your project.

The issue is incompatible web application version with the targeted server. So project facets needs to be changed. In most of the cases the "Dynamic Web Module" property. This should be the value of the servlet-api version supported by the server.

In my case,

I tried changing the web_app value in web.xml. It did not worked.

I tried changing the project facet by right clicking on project properties(as mentioned above), did not work.

What worked is: Changing "version" value as in jst.web to right version from

org.eclipse.wst.common.project.facet.core.xml file. This file is present in the .setting folder under your project root directory.

You may also look at this

if your project maven based, you can also try updating your project maven config by selecting project. Right click project> Maven>Update Project option. it will update your project config.