I loaded the script, set it up according to instructions. . .  it was working fine.  I came back to work on it some more and add new dept. s and operators and I now get the following message.

Rather than tracing the problem in the code does anyone know why the following might happen?

Warning: fopen(/home/tltxl/public_html/Concierge/class/. . /cache/hcl_operators/65d5b8d53eb7eb6f865e5f4d8a3dae00. dbc) [function. fopen]: failed to open stream: Permission denied in /home/tltxl/public_html/Concierge/class/database. php on line 319

Warning: Cannot modify header information - headers already sent by (output started at /home/tltxl/public_html/Concierge/class/database. php:319) in /home/tltxl/public_html/Concierge/admin/login. php on line 41