I get error massage " Unable to open the file <rank=0,ar​g_name=H:/​Path/filen​ame.mdl "

I am trying to run Abaqus model in matlab and i get this error massage " Unable to open the file <rank=0,arg_name=H:/Path/filename.mdl " while Abaqus running. It seems that the matlab can not see or open this mdl file. It does not appear always but I often need to run the script multiple times to bypass it.

[Andreas Goser]

Please look at your question again. Do you really mean "Abaqus"? Or do you want to open a Simulink model (MDL files extension). And do you use any MATLAB/Simulink to Abaqus interface?