Why I can't decrypt a string by RC4

Question

I need to encrypt string variable by RC4 but When I convert it to byte [] and reconvert to string it dosen't decrypted

        String name = "wael sy";
         byte[] encrypt = RC4.encrypt(name.getBytes( ), "key");

        String encstr =new String(encrypt); 
        System.out.println(encstr );  

        // byte[] decrypt = RC4.decrypt(encrypt , "key"); its work
          byte[] decrypt = RC4.decrypt(encstr.getBytes() , "key");
         String decrstr = new String(decrypt );


        System.out.println(decrstr );