I use the boost asio ssl server from this 
when test.db is incorrectly created e.g.:
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE table1(oops int);
COMMIT;
client: 127.0.0.1
connection ok
sqlite3_prepare_v2 returns an error => 1
parameter count statement = 0
when the file test.db doesn't exist at all, the output is the same:
client: 127.0.0.1
connection ok
sqlite3_prepare_v2 returns an error => 1
parameter count statement = 0
So, check that the file exists (in the working directory where the executable is run) and is accessible, and it contains the required schema.