Wireless is not associated

Good could someone help me to solve this problem I have a tl-wr740n when I connect to the network in client mode it connects but after a while it disconnects and shows Wireless is not associated

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English... Use english.

Good could someone help me to solve this problem I have a tl-wr740n when I connect to the network in client mode it connects but after a while it disconnects and shows Wireless is not associated

What type is the router that owns the wireless network ?
Can you post a part of the logs from wireless server and client when the client disconnects, plus the client /etc/config/wireless ?

And of course please don't post passwords, ...