Trending @Capgemini; Project realize

I have looked at the project thoroughly, but it doesn’t match my skills, and I’m not able to understand it properly. It’s been a month since I joined the project, and I want to request the manager to release me from it. Skill -java but project on old technology and I am only one developer there as java developer and client also don’t kinks about api documentation and all can I ask manager to realize from project