If the driver for the card is not installed or loaded properly, the Aironet Client Utility (ACU) displays this error message (Linux).
To resolve this issue, perform these steps:
Another reason for the error message could be that the kernel has been compiled without the appropriate wireless options.
When compiling the kernel, do so without Personal Computer Memory Card International Association (PCMCIA) support.
Note: Support for the card will be added when you install the latest pcmcia-cs.
There are also other solutions available for this
WLAN adapters (wireless card) / ACU (Aironet Client Utility)