GUI Compilation error

[Altera_Forum]

Hallo all!, 

 Please let me know what changes to be made in the ALTERA QUARTUSII 9.2 web edition tool to remove the error. I'm attaching VHDL code too.   Thanks all!     Error (10481): VHDL Use Clause error at alu.vhd(6): design library "work" does not contain primary unit "alu_packages" Error (10800): VHDL error at alu.vhd(6): selected name in use clause is not an expanded name Error: Quartus II Analysis & Synthesis was unsuccessful. 2 errors, 0 warnings Error: Quartus II Full Compilation was unsuccessful. 4 errors, 0 warnings

[Altera_Forum]

I'd delete clause: 

 use work.alu_packages.all;  ¿Why do you use clk? All the circuit is combinational logic.