thanks for all the help provided and possible solutions and your time guys I really appreciate it
finally i solved this error by going to steam folder and deleted every thing except
-steamapps
-steam.exe
after that i just double clicked steam.exe and it updated the whole thing as fresh installation
i just logged in my account and game worked like charm!
this is how i fixed this problem it may now be closed and moved to solved section
thanks you all have a nice day/night
peace.
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Agent 14's post in Ets2/ATS cannot access steam client was marked as the answer