Hmm, this is where the hard part begins. Please post here your .daConfig file.
Also I would like to take a look at the actual exception trace of this error. There is two ways to get it: either via attaching debugger to the Schema Modeler process or (atm this would be faster and easier) by using this small project: ConnectionTester.zip (3.8 KB)
Add your .daConfig as resource (so Data Abstract will see the new driver definition) and set the connection string value in this line:
var connectionString = @"SQLite.NET?Server=localhost;Database=C:\Users\Public\Documents\RemObjects Samples\Database\PCTrade.sqlite.db;";
Then run the app and it will show what exactly did fail. Please post this info here too.