LMS Amesim uses the MATLAB enviromental variable to launch matlab.
I can see from the error message that the variable might be set to the wrong path: it has the "bin" folder twice, since LMS Amesim will append the "bin\win32\matlab.exe" the the value of the MATLAB variable.
If I was you I would first confirm that my matlab executable (the matlab.exe file) is located in the C:\MATLAB\R2016a\bin\win32\matlab.exe path. And then I would update the MATLAB to C:\MATLAB\R2016a (as Domi suggested below).
You can get more help in LMS Amesim's online help (by pressing F1 or clicking the Help menu on the top then on Online). Once the help opens, click on the "Search" tab, then type in "matlab".
The first result should be " ". This chapter will help you confirm and set up the interface to matlab.
I hope this helps!