[C] Errore SQLite3

[Sevenarth]

Ciao a tutti!
Ho avuto un problema con SQLite3 per C (amalgamation version, compresa di sqlite3.h, sqlite3.c e sqlite3.def), praticamente quando cerco di creare uno statement da database aperto, mi da quest'errore:

library routine called out of sequence

Questo è il codice:

#include <stdio.h>
#include <string.h>
#include "sqlite3.h"

sqlite3 *db;

void OpenDatabase(const char *db_name){
    char name[100];
    if(!strstr(db_name, ".db")){
        sprintf(name, "%s.db", db_name);
    }
    
    char *fname = (char *)name;
    
    FILE *stream;
    stream = fopen(fname, "r");
    
    int rc = sqlite3_open(fname, &db);
    if(rc){
        DieWM("sqlite.c", "cannot open database.");
    }
    if(stream) Success("sqlite.c", "Database opened successfully!\n");
    else Success("sqlite.c", "Database created and opened successfully!\n");
}

sqlite3_stmt * DatabaseQuery(const char *query, const char *INTERNAL, int line){
    sqlite3_stmt * stmt;
    int prep;
    prep = sqlite3_prepare(&db, query, strlen(query)+1, &stmt, NULL);
    if(prep != SQLITE_OK){
        char cstring[100];
        sprintf(cstring, "%d: DatabaseQuery: %s", line, sqlite3_errmsg(&db)); 
        DieWM(INTERNAL, (char *)cstring);
    } 
    return stmt;
}

const unsigned char *GetColumnString(sqlite3_stmt * stmt, int column){
    const unsigned char *result = sqlite3_column_text(stmt, column);
    return result;
}

int GetColumnInteger(sqlite3_stmt * stmt, int column){
    int result = sqlite3_column_int(stmt, column);
    return result;
} 

Il database lo apre correttamente, ma la creazione dello statement non va..