GDB no debugging symbols found, after assembling with -g -F options

Question

i'm very new in assembly (nasm x86_64), and i run into a problem while i tried to use gdb, which says "no debugging symbols found" after assembling with -g -F dwarf options. I know that the problem can be caused by using .txt instead of .text, but i have corrected it and it didn't really help. I tried to google it, but i haven't found a solution. My .asm and makefile are on the screenshot. P.S. sorry my poor english.