TL;DR version: It’s located in language under Validation -> lang_errm_dbcn_data
Now the version for the people that like a good read and love happy endings:
Not too long ago I was getting this error too but that was because my database connection wasn’t setup correctly (if I remember correctly). Now as every sane person (obviously) would do I directly opened up the index.php from my main_menu and started looking where the error got echo’d. Now I’ve done my fair share of skimming code/texts so it didn’t take all that long to find this piece of code:
[INDENT]echo "<table width=\"80%\" border=\"1\" height=\"117\">";
echo "<tr>";
echo " <td class=\"css_menu_sel\">";
echo " <b><font size=\"4\">" . $this->Nm_lang['lang_errm_dbcn_data'] . "</font>";
echo " </b></td>";
echo " </tr>";
echo "</table>";[/INDENT]
Now as every maniac (this is the part where I stop referring to myself as sane person) can see in a quick glance this is an error message that gets the message from a Nm_lang (NetMake Language), so presuminly it’s stored somewhere in the language settings.
And for the happy ending: After seeing it being echo’d there I could see where in the code it originated from and what was causing it and from the code I deduced that it was a flaw in my database connection settings, I fixed it and me and my project/applicaton lived happily ever after.