Been happening in previous DEV versions (102980,103003,103048) already reported... Ticket #0004372
May 10 2016
Your not alone, seems latest build has changed name to referenced addon "A3_soft_F_Galkin"..Had to remove over 20 missions with this error message so far!
You might have to open the mission.sqm in text editor and manually change/remove any reference to "A3_soft_F_Galkin" in the addon list to get it open in editor, then resave the mission in latest version.
I can confirm, Throw 2 grenades on Stable version 103279...Crashes server..
Still appears fixed in DEV version 103342.
Maybe same issue was not fixed in latest Stable version?
Appears fixed in latest DEV Build 103342
Same again for latest Dev Build 103078
Uploaded latest server crash reports.