Wifi password doesn't work on my Macbook Air

My WiFi Password works on other Macs I own, my Android, and my iPad. However, it will not work on my Macbook Air. It senses the WiFi, but it continues to say the password is incorrect. I know that the type is WEP and that is what I have selected. Any idea of what the problem could be?

I had this problem but managed to fix it tonight. The problem is half with my Macbook Air and half with my router (I use a BT Home Hub 5).
My router is dual band and was configured to combine the 2.4ghz and 5ghz networks into one. All my other devices (including two iPhones, apple tv and iMac!) were fine but Macbook Air kept rejecting password even though it was correct.
I went into router settings and then advanced settings. I unticked the option to combine the networks and renamed the 5ghz network to something else.
This instantly fixed the issue.
Hope that helps

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