Fatal error: Uncaught exception 'UcAddressesInvalidFieldException' with message 'Invalid field name ...

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Do you have created any extra address fields with Extra Fields Pane? If yes, did they appear in the delivery checkout pane?

I did add (admin/store/settings/addressfields/add) three extra address fields with Extra Fields Pane, two assigned to Billing pane and one assigned to Delivery pane, all three as fieldtype Textfield, none of the three checked as required. All three listed at admin/store/settings/checkout/edit/fields page. Besides those I have not added any Custom order fields.

As which kind of user you did you got this error? Was it the superuser (user 1), an authenticated user or an anonymous user (I don't suspect it was an anonymous user, as that user usually doesn't have any addresses)?

I did get the error both as user1 and as an authenticated user. Haven't tried as anonymous as I will not permit anonymous to send orders.

How many addresses does the user have in it's address book? Is the default billing address equal to the default shipping address?

I did add only two addreses for user1 and 2 addresses for the authenticated user (test account). The fields that appear in Default billing address (where I entered text in two of the three extra fields) also appear in Default shipping address (where I entered text in one of the three extra fields)

Do the addresses that were chosen at checkout have values for extra address fields?

Yes, using the values from current user's Address Book as default values.

Did you go to checkout review without any other errors (e.g. "Field x is a required field.")?

No "field x is required" or other errors.

But meanwhile I'm writing this reply I'm thinking that maybe the mentioned error occurs cause I'm using the module Optional Checkout Review (6.x-1.x-dev) - which enables the possibility to skip the "Order review" page meaning that when clicking the "Submit Order" button the order is sent - and I see now at extra address fields edit, that the checkbox for Order review page (page where the order is reviewed by a customer before the order is submitted) was enabled at all three extra adress fields, it should be disabled I guess.

Edit: I tried to disable the Order review page checkbox, no difference, the error remains. Further, after getting the mentioned error above if I refresh the page I sometimes get the message notification: "An illegal choice has been detected. Please contact the site administrator." as well that the Adress book select fields at cart/checkout page get red marked (.error)

Edit2: Thinking further, the error may occurs when certain fields at cart/checkout page are left empty and those fields are included in ubercart/uc_order/templates/tpl.php files' lines without if/else statements?

Edit3: As you said although you have tested Extra Fields Pane together with Ubercart Addresses heavily and didn't encountered this bug yet. Til now I have also tested heavily... disabled other uc modules to find out if there are any conflict, also tried to change some lines in uc_order templates etc, finally tracked it down to think that Extra Fields Pane/UC Addresses conflict with Optional Checkout Review module (skips the Order review page).
Would be great if you would try to install/enable the UC Optional Checkout Review module/enable skip the Order review page checkbox at checkout settings, to verify if that is causing the error.

Hello again, I appreciate your replies.

Regarding
Ubercart Addresses 6.x-2.0-alpha1+7-dev
Extra Fields Pane 6.x-2.0-beta2
vs
Optional Checkout Review 6.x-1.x-dev

When I have time to test, I shall install the Optional Checkout Review module. Meanwhile, you could test if the error is still there when you (temporary) disable that module.

Having the 'Skip checkout review' checkbox unchecked at Checkout settings, everything goes normal without no errors.

So I am pretty sure that the UC contributed module Optional Checkout Review (skip the Order review page) is causing the 'Uncaught exception UcAddressesInvalidFieldException' error. Since the mentioned error seems to happen only when having the 'Skip checkout review' checkbox enabled at Checkout settings. When this checkbox is unselected everything goes normal. I believe that it would be possible to solve the issue by adding some lines to either your UC Addresses module or to UC Optional Checkout Review module ('uc_optional_review_checkout.module' or/and 'uc_optional_review_checkout.js').

Have I understand well that you get the error every time you click the button "Review order" on the checkout page when you start with a "fresh" checkout? Or does it also happen in this case:
1. Go to checkout.
2. Don't fill in a required field.
3. Click "Review order" button.
4. Receive error message about the required field.
5. Fill in a required field.
6. Click "Review order" button.

If I have the 'Skip checkout review' checkbox checked at Checkout settings (checkbox rendered by Optional Checkout Review module) the "Review order" button will not appear, but instead the "Submit order" button will appear in that place (since the purpose of UC Optional Checkout Review module is to get the possibility to skip the "Review order" step.
So, the error seems to happen only when click "Submit order" button at 'cart/checkout' page (when 'Skip checkout review' checkbox is enabled/checked as mentioned above). Error doesn't happen in the other cases you mention above.

Don't know if it has importance but I also have these UC contributed modules installed:
Ajax Attribute Calculations 6.x-2.x-dev
Ajax Driven Cart 6.x-2.1
Delivery Time slot 6.x-1.0-beta4
Donation Incentives 6.x-1.1
Pictured cart block 6.x-1.0-beta3
Terms and conditions 6.x-1.0
Ubercart Profile Integration 6.x-2.x-dev
Ubercart Rule Integration 6.x-1.0-rc1
Ubercart Webform Checkout Pane 6.x-3.8

@MegaChriz

Mega great ;) Thanks for solving the issue so quickly. And I can confirm that it works now

Sorry to reopen this issue..

But I've just seen that the Uncaught exception 'UcAddressesInvalidFieldException' error message also appear when trying to access Order history - view, edit etc. I didn't see this before so I'm not sure if it's because I've changed anything else since then. Would be great if you get the possibility to verify if you get Uncaught exception 'UcAddressesInvalidFieldException' error message when clicking view, edit etc at Order history.

I'm using 6.x-2.0-beta2, as well I added the new lines according to your commit to class/UCXF_Value.class.php.
Error occuring on all orders at the moment.

I'll try to update from 6.x-2.0-beta2 to latest dev. Will give you answer in a moment..

Edit: I've tested with latest dev now, the error is still there.

Mentioned I've tested with latest dev til now, but the error is still there. I've no clue what could possibly cause the error..

I guess viewing orders worked earlier with Extra Fields Pane installed, since I didn't notice this error until now.. I'll take a look what new modules have been installed lately..

Fatal error: Uncaught exception 'UcAddressesInvalidFieldException' with message 'Invalid field name title' in /*/sites/all/modules/uc_addresses/class/UcAddressesSchemaAddress.class.php:244 Stack trace: #0 /*/sites/all/modules/uc_addresses/class/UcAddressesSchemaAddress.class.php(187): UcAddressesSchemaAddress::fieldMustExist('title') #1 /*/sites/all/modules/uc_addresses/class/UcAddressesAddress.class.php(263): UcAddressesSchemaAddress->setField('title', '') #2 /*/sites/all/modules/uc_addresses/uc_addresses.module(661): UcAddressesAddress->setField('title', '') #3 /*/sites/all/modules/ubercart/uc_order/uc_order.module(1474): uc_addresses_order('load', Object(stdClass), NULL) #4 /*/sites/all/modules/ubercart/uc_order/uc_order.module(1199): uc_order_module_invoke('load', Object(stdClass in /*/sites/all/modules/uc_addresses/class/UcAddressesSchemaAddress.class.php on line 244

Some week ago I was enabling and few minutes after disabling the Ubercart Addresses Example submodule, as you say.
And I did now uninstall the Ubercart Addresses Example module, which solved the problem.