Classes have changed completely to XML tags with errors

Mohamed Akl :

I was working on an android app normally and then when opening the project today i found that all the project contain errors after build, most of java classes -specially activities - have changed to some type of XML that i don't understand. When opening these classes this is what is written instead of complete java files:

 <component name="libraryTable">
  <library name="Gradle: com.squareup.retrofit2:retrofit:2.4.0@jar">
    <CLASSES>
      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/retrofit/2.4.0/fc4aa382632bfaa7be7b41579efba41d5a71ecf3/retrofit-2.4.0.jar!/" />
    </CLASSES>
    <JAVADOC />
    <SOURCES>
      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/retrofit/2.4.0/451207353948708405a08287e2a315c3f23553fe/retrofit-2.4.0-sources.jar!/" />
    </SOURCES>
  </library>
</component>  

I've checked version control and it turns out that no files where changed to cause this error.

also when i try to run the app an error occurs that no launcher activity found for the project. What could be the cause of this problem? I tried removing all gradle and reinstalling it again as well as reinstalling android studio.

Thanks

Aliasgar :

i think your project is deleted that's why it is showing this. another thing is try closing and reopen the android studio.