Error while running in quartus

Dear all,

Due to this line in my project I got errors

LEDR <= std_logic_vector(to_unsigned(result,10) );

this is my error in my project

Error (10029): Constant driver at lb.vhd(65)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[8]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[7]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[6]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[5]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[4]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[3]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[2]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[1]" at lb.vhd(23)

Error (10028): Can't resolve multiple constant drivers for net "LEDR[0]" at lb.vhd(23)

Error (12153): Can't elaborate top-level user hierarchy

Error: Quartus Prime Analysis & Synthesis was unsuccessful. 12 errors, 2 warnings

Help me out please.

Thanks