PHP errors

[Rob Welsh]

First off, like the software. Second, saves the school money - very grateful. However unfortunately I have a few error reports:

Creating a "Room" causes 4 x PHP errors:

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: controllers/rooms.php

Line Number: 290

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: fieldvalues

Filename: controllers/rooms.php

Line Number: 307

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: models/rooms_model.php

Line Number: 412

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at ……/system/libraries/Exceptions.php:164)

Filename: helpers/url_helper.php

Line Number: 447

Clicking on "Make Recurring Booking" twice causes a similar issue.

Adding a "Period" and not clicking the "allow booking" tick box causes a similar issue.

In all circumstances the correct entries appear to be created but there are multiple warnings - I'd be grateful for any help.