Modelsim error

Thank you so much for your reply.I tried the line suggested by you .It is showing the following error.

no feasible entries for subprogram "to_unsigned".

So I changed the mod _d to (9 downto 0).

mod_d <= unsigned(to_ufixed(resize((abs(dx)+abs(dy)),9,0)));

This is giving correct mod and division values with respect to different dx and dy values.

Now the error is same.if I am changinf the simulation setting to (Simulation-Run time option-message severity-error),it is showing following error.

# ** error: fixed_pkg unbounded number passed, was a literal used?

# time: 783 us iteration: 0 process: /camera/uut/angle1 file: c:/users/embedded/desktop/new/fixed_pkg.vhdl

# break in subprogram mine at c:/users/embedded/desktop/new/fixed_pkg.vhdl line 2061.

So is it mean thet error is in process angle1.As i read in some sites that this error caused if we use negative indexing,which I have not used through out the code.Please help me with this .I am not getting what to do.I am attaching the new file with some modifications in it.