Error while opening Simulink model into previous versions

Hello to all of you, I have a problem opening a Simulink model made in the 8.9 (R2017a) version. I properly exported the .mdl file so i could open it in the R2016a version and the R2010b version, but unfortunately i got two different errors while opening the file in these two older versions.

Error in R2016a:

Error in R2010b:

When my colleges are opening my model in their version they are receiving these errors, but in can normally open both my original file and my exported files in my R2017a version of MATLAB/Simulink.

Please help me because this is part of a work for my university and I have to finish it so it can properly open in R2010b version. Thank you.