scorz wroteCheck network addressing, try disabling dhcp -if it's on on the router- or check if the network address is the same on both AP and router.
if i disable DHCP i wont be able to connect my devices without ip addresses and concerning the network address my router LAN address is 192.168.0.1 and on AP its 192.168.0.50 LAN
in my TP-LINK router dynamic setting is chosen by,default and when i plug in the ethernet cable its stays on 0.0.0.0 and does not take automatically i tried using a static IP didn't work either