IOError: [Errno 12] Not enough space

[LnT]

Hi,

version information

python 27
java version "1.8.0_111"
OS -Win 10 , 64Bit , 8GB RAM , 60GB HD

executing python test script (robotframework) for a we bapplication 
Application url will be invoked by Firefox 38.0

Please find below log:
--------------------------------------------------------------------
Opening browser 'firefox' to base url 'https://onbdev.nbpa.com/zae'
[ WARN ] Keyword 'Capture Page Screenshot' could not be run on failure: No browser is open
| FAIL |
IOError: [Errno 12] Not enough space
--------------------------------------------------------------------

I have cleared %TEMP% and reran the script.
But still I see this.

Could you please show me some Light ?

Regards,
LnT