Animal95

I hope you guys can help! Please let me know if this needs to go on another section.... i have been working on a city for a few days, with everything going great. went back into it yesterday and after the city loaded I rec'd the following message: Plugin Pack 342978908 is missing. i was able to continue on and play the city with no problems, but now I keep getting that same message everytime I load it up.....where can I find that plugin? Thanks in advance!