error opening!: 14 in select statement in sqlite using objective c

I'm facing a strength problem on fetching database. My codes works fine normally but when I fetch value from database repeatedly in small period time its showing error opening!: 14 sql_lite error that means it can't open the database. My Codes are shown below :

#import "sqlite3.h"
#import "FMDatabase.h"

+ (NSString *)getDBPath
{
    NSString *dbPath=[TPUtlis applicationDocumentsDirectory];
    dbPath=[dbPath stringByAppendingPathComponent:DATABASE_FILE_PATH];
    dbPath=[TPUtlis getDirectoryAtPath:dbPath withInterMediateDirectory:NO];
    dbPath=[dbPath stringByAppendingPathComponent:DATABASE_NAME];
    return dbPath;
}
+ (FMDatabase *)getDatabase
{
    FMDatabase *database = [FMDatabase databaseWithPath:[DBManager getDBPath]];
    if([database open]) return database;
    else return nil;
}
+ (NSMutableArray*)fetchmenu:(int)startLimit noOfRows:(int)noOfRows
{
     NSMutableArray *arr = [[NSMutableArray alloc]init];
     FMDatabase *database=[DBManager getDatabase];
     if(database)
     {
        sqlite3 *database;
        NSString *dbpath = [DBManager getDBPath];
        const char* dbPath=[dbpath UTF8String];

        if(sqlite3_open(dbPath, &database)==SQLITE_OK)
        {
            NSString *stm = [NSString stringWithFormat:@"SELECT * FROM menulist ORDER BY menuOrder limit %d,%d",startLimit, noOfRows];

            //NSLog(@"Executed Menu Query with limits: %@", stm);

            const char *sqlQuerry= [stm UTF8String];
            sqlite3_stmt *querryStatement;
            if(sqlite3_prepare_v2(database, sqlQuerry, -1, &querryStatement, NULL)==SQLITE_OK)
            {
                NSLog(@"conversion successful....");
                while (sqlite3_step(querryStatement)==SQLITE_ROW)
                {
                   NSMutableDictionary *menuMsgDict = [[NSMutableDictionary alloc] init];

                   [menuMsgDict setValue:[[NSString alloc] initWithUTF8String:
(const char *)sqlite3_column_text(querryStatement, 0)] forKey:@"MenuId"];
                   [menuMsgDict setValue:[[NSString alloc] initWithUTF8String:
(const char *)sqlite3_column_text(querryStatement, 1)] forKey:@"MenuName"];

                   [menuMsgDict setValue:@"" forKey:@"SubMenu"];
                   [arr addObject:menuMsgDict];
               }
               sqlite3_reset(querryStatement);
            }
            else 
                NSLog(@"error while conversion....");

                sqlite3_close(database);
        }
   }  
    return arr;
}

What is wrong with this code? Please help me out.