I deleted multilib.db thinking it was a file that i could delete(great).Next time when i tried to boot up Manjaro,it was just black screen.So,i got my Manjaro Live USB and used manjaro-chroot -a .I tried sudo pacman -Syyu but i got error:
[manjaro /]# sudo pacman -Syyu
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
:: Synchronizing package databases...
core 168.9 KiB 61.9 KiB/s 00:03 [#####################################################################] 100%
extra 1918.7 KiB 121 KiB/s 00:16 [#####################################################################] 100%
community 6.8 MiB 337 KiB/s 00:21 [#####################################################################] 100%
multilib 176.5 KiB 337 KiB/s 00:01 [#####################################################################] 100%
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: failed to synchronize all databases (invalid or corrupted database (PGP signature))