COnfig Wlan and Error disconecct

Hello,
I have two problems to see if I can help.
The first is that when users connect them get this error comes out of the picture log.

And the other hand I have this hardware:

RB/600A RouterBOARD 600A with RouterOS Level 4 license 1
XR2 Mini PCI Xtreme 600 mW 1
CA3N002 HyperGain® 400-Series Antenna Cable Assemblies NM-NM 2 ft.
HG2420P-120 20 dBi 120° Sector Panel WLAN Antenna 1

but not how to configure the interface wlan1 to have the largest coverage

I hope you can help me.

Thank you very much
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