Hello,
it is likely an issue with setting the wifi dongle into AP mode (creating a wifi access point).
*Luckily*, at least in theory it is possible to make it work on the RPi!
http://blog.sip2serve.com/post/38010690418/raspberry-pi-access-point-using-rtl8192cu
This is a short guide someone made with a wifi dongle that uses the same RTl8192cu Chipset as your card.
Give it a try and please report back if you were successful.
Unfortunately people often have issues with getting the right wifi dongles that can support AP mode :S
it is likely an issue with setting the wifi dongle into AP mode (creating a wifi access point).
*Luckily*, at least in theory it is possible to make it work on the RPi!
http://blog.sip2serve.com/post/38010690418/raspberry-pi-access-point-using-rtl8192cu
This is a short guide someone made with a wifi dongle that uses the same RTl8192cu Chipset as your card.
Give it a try and please report back if you were successful.
Unfortunately people often have issues with getting the right wifi dongles that can support AP mode :S