Hi if someone also gets the message "error - problem connecting" this might help (own experience - no claim to absolute correctness):
I got this message while using the latest version of raspbian with pixel desktop. It seems that there are some issues with realvnc and xrdp/thightvnc

What worked for me is:
First removing realvnc and xrdp with:

sudo apt-get remove realvnc-vnc-server -y
sudo apt-get remove realvnc-vnc-server -y
sudo apt-get remove xrdp -y
sudo apt-get remove tightvncserver -y
sudo apt-get remove vnc4server -y

clearing rest:

sudo apt-get autoclean
sudo apt-get autoremove -y

and then installing it in this order (other order caused the same problem again)

sudo apt-get install tightvncserver -y
sudo apt-get install xrdp -y
sudo reboot

after that problem was gone.