chess clock coding using quartus II

i have another problem like this

Error (10397): VHDL Event Expression error at timer.vhd(15): can't form clock edge from S'EVENT by combining it with an expression that depends on a signal besides S

Error (10658): VHDL Operator error at timer.vhd(15): failed to evaluate call to operator ""and""

Error: Can't elaborate top-level user hierarchy

one more thing i wanna ask you, the package should be written in the coding or separated?