javax.crypto。badpaddpaddingexception:给出的最终块在解密发送给服务器的字节时不能正确填充

I am creating a secure chat client and server combo that, when finished, will have multiple layers of encryption. However, I don't understand why I am getting this error. I know there are multiple questions out there with many different answers (some so different I don't understand how anyone gets their problem resolved), however I have yet to find one that I can understand enough of to fix this error.I am creating a secure chat client and server c