I got error because of not proper use of std_logic and bit, please help me in solving

The std_logic_arith library defines its own signed and unsigned types, but does not include sra and srl functions. It is also NOT an IEEE standard library (neither is std_logic_signed/unsigned)

numeric_std defines its own signed/unsigned types and also includes sra/srl functions, and it IS the IEEE standard library. Using numeric_std and std_logic_arith in the same file causes conflicts that will cause neither of them to work (unless you reference everything specifically).

The answer is to delete std_logic_arith.