I use VOXATC in Prepar3d 2.2 and got tired of the default traffic in Prepar3d, I got rid of the default airliners but kept the default GA traffic and installed world of AI. I got rid of the default airliner traffic by deleting and backing up the default airliners in the Simobjects folder. I ran the indexer and it indexed everything just fine. Now when I'm in Prepar3d and I initialize VOXATC it will give me a Fatal error. I should add that before I got rid of the default airliner traffic that I tested VOXATC with WOAI installed and default traffic and it worked perfectly. This problem only occurred once I got rid of the default airliners.