U.G.S. 1.0.7 Error while starting filestream : Null

[Elieheloua]

Hi,
My gcode file are 3.6 Mo and create by CAMBAM.
I click a send button on Universal Gcode Sender (Version 1.0.7),
i have message : Error while strating filestream : Null.
If my gcode file are less 2.5 Mo, i have nott his problem. I not understand why ???
Have problem with software or GRBL frimware ?
Have you this problem ?
Regard
Elie