Error during mblock simulation

[longcoming]

I am getting this error when ı try to simulate mblock:
[sandboxScript:info] Simulator launched, welcome!
[CoppeliaSim:info] Loading scene...
[CoppeliaSim:info] Default scene was set-up.
[CoppeliaSim:info] Loading scene (C:/Users/serdar/Downloads/Compressed/V-REP demo odalar/Demo room 1.ttt). Serialization version is 23.
[CoppeliaSim:info] File was previously written with CoppeliaSim version 4.03.00 (rev 10)
[CoppeliaSim:info] Scene opened.
[CoppeliaSim:info] Scene infos:
CAD models in this scene are courtesy of Lyall Randell. For more models from Lyall Randell search for 'Crazy Eyes' in Google 3D Warehouse.

One or more textures on this 3D model have been created with images from CGTextures.com. These images may not be redistributed by default, please visit www.cgtextures.com for more information.
[sandboxScript:info] Simulation started.
[/mBot/mBotScript@childScript:error] [string "/mBot/mBotScript@childScript"]:554: serialRead: argument 4 must be a string
stack traceback:
[C]: in function 'error'
... Files/CoppeliaRobotics/CoppeliaSimEdu/lua/checkargs.lua:147: in function 'checkargsEx'
(...tail calls...)
...rogram Files/CoppeliaRobotics/CoppeliaSimEdu/lua/sim.lua:1073: in field 'serialRead'
[string "/mBot/mBotScript@childScript"]:554: in function 'sim_code_function_to_run'

I don't know what to do.I haven't been able to simulate mblock with v-rep edu.
Could you point me to the right direction?
Thanks in advance.

I solved my problem using an older version.
Thanks anyway

[coppelia]

Hello,

please share the scene file, since we don't know any mBot robot that we directly support.

Cheers