not sure your case is similar to
https://coderanch.com/t/55466/Struts/Cannot-find-message-resources i think if you post your code here would be useful for all of us to tackle your problem
here i will have quick scan whether i will miss out some steps as below :
1) is the messageresources.property file in \web-inf\classes ?
2) do you put the key into resource file ?
3) do you put the right name for property file ? example if you code as below
then
you should have PagesResources.property in related folder .
hope this informtion can be useful