problem together - help-

[CRAZYMAD]

Bye to all,
I'm creating a set with different parts quite simple and until here everything well last night I finish mating and save.
Today I reopen the axieme and present all the parts with an icon that I had never seen and I can do nothing and every movement I try to make the parts makes me crash the program
I attach tree photos maybe someone can help me

 

[MassiVonWeizen]

write in the profile the version of solid in order to do targeted searches
edit: I see that you have modules like nmsuite sw, which I don't know what it is, so it would be useful if you indicated the additional modules so as to include them in the research

 

[MassiVonWeizen]

The icon is this http://help.solidworks.com/2019/italian/solidworks/sldworks/c_previous_release_interoperability.htmThis really made me feel bad

 

[CRAZYMAD]

Wow sorry so much but I came to Wednesday and I was already fused
because for some customers I use 2018 and other 2019 I must have messed up and saved in 2019 what was needed in 2018 and I did not jump out anymore