What is SQLite3 Disk I/O Error in Cocoa

I am programming in snow Leopard 10.6. My application opens up a locally stored database successfully, but when it tries to insert into the database, I continue to receive 'Disk I/O error". Anyone has any ideas as to what could possibly cause this?

Thanks Yang

From stackoverflow

• From sqlite.org:

  SQLITE_IOERR

  This value is returned if the operating system informs SQLite that it is unable to perform some disk I/O operation. This could mean that there is no more space left on the disk.

  This could be one reason. Another could be insufficient rights (maybe the db-file is write protected?).

  HTH, flokra

  ReachConnection : how can i check to see if the proper right to manage the file? because the database that i'm testing with is only 4kb. I tried to include chmod(filename, (S_IRUSR|S_IWUSR) | (S_IRGRP|S_IWGRP) | (S_IROTH|S_IWOTH)); but I get an error that says chmod is not defined