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I have the same error.
A fix was mentioned, is it out?
If not what can I do in the meantime..?

I got the following error when trying to edit and delete a custom field.

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Rel_ft::$db

Filename: fieldtypes/ft.rel.php

Line Number: 202

Hi, HoneyWeb.

what you do is this:
in this file:
expressionengine/fieldtypes/ft.rel.php

replace this text:
$this->db

with this text:
$this->EE->db

That will fix the problem.

Does that help?

Yes that worked.
I was able to delete custom fields.

I got another error though, and please help me to know if this is a problem with EE or strictly my database, because I am a bit of a novice with DB’s.

I got this error when I tried to delete the Field Group.

///////////

A Database Error Occurred

Error Number: 1091

Can’t DROP ‘field_id_7’; check that column/key exists

ALTER TABLE `exp_channel_data` DROP `field_id_7`

Filename: C:\inetpub\sites\domain.com\wwwroot\hw\codeigniter\system\database\DB_driver.php

Line Number: 330

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[Mod Edit: Post edited and image removed for security reasons]

Hi HoneyWeb,

Which version and build of EE are you using on this server? Is this a site that has been upgraded from EE 1.x? Which addons do you have installed and have you imported or created any entries outside of the site publish form?

Cheers

Greg

EE 2.1.3
Structure 2.2
Brilliant Retail 1.0.0
Wygwam 2.1.7

On EE install i installed Brilliant Retails dummy info.

I have installed EE a couple of times over the top of the database, would that make a difference.

Site info (PHP etc) here - http://shop.honeyweb.com.au/info.php

Can’t DROP ‘field_id_7’; check that column/key exists

Was that the field that you deleted earlier?