output displayed is:
$ ./run-remoteapp.sh
loading plugin /usr/lib/freerdp/rail.so
connected to 23.21.26.148.3389
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 1 (X_CreateWindow)
Serial number of failed request: 36
Current serial number in output stream: 40
I did a google search and saw that this had been reported about 2 months ago and
Oleksandr Shneyder had found the cause and built a "patch" which you can read about here:
https://github.com/FreeRDP/FreeRDP/issues/465