I keep getting this error on my code when debugging: Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\project\index.php on line

Here is the code I am working with:

Select Image:

Caption

Photo Archieve

'; echo '

'; echo '

'.$row['caption'].'

'; echo ''; } ?>

How do I fix the problem? What code should be inserted?