1.First of all, check if your source is where it is mentioned in the error log.
2.If it is, check if you've made any typing mistakes
3.If it still isn't working, it would be easier (In my opinion) to create a new project and rename what is missing (I've done this several times already and it has always worked) Of course, make sure you copy all of your code
your error does not belong to the manifest, cuz this would be mentioned in the log like this: have youe declared <yourClass> in AdroidManifest.xml?