If you are seeing similar warnings it would usually mean that you need to add missing custom fields to your project screens.
Identify your missing fields
First of all you need to identify what your custom fields stand for. These fields have numbers and obviously are different for different instances so you have to pay attention to your 'Program warnings' screen which gives you the 'Project key' and the 'customfield_number' you need to look after.
Now go to Settings >> Add-ons >> BigPcture/BigGantt configuration menu on the left and find the fields.
Add the missing fields to your project
Once you know what your fields are, you have to add these fields to the screens of your project.
Go to your projects in Jira and choose the project identified by the KEY you see in the error prompt.
Choose any issue, open it in new browser taband click on the "See the old view" link.
From the 'Admin' dropdown menu choose 'Where is my field?'
Start typing in the name of the field which you identified is related to your error and choose it from loaded options.
Once you get the dialog box , scroll down the prompt and click the "Scrum Default Issue Screen" link next to red [X] icon.
It will take you to the "Issues Configuration screen".
Here you need to add the name of the field which you identified is related to your error at the bottom 'Select Field' input.
Be sure to add all your missing fields.
Clear the error log
The final step is to click 'Clear log' button as soon as the pop-up error message appears again.
That's it but if you still need more information you can find detailed documentation in this article.
In case you still have problems
Finally in case you still need help remember, you can always contact our helpful support staff at firstname.lastname@example.org who are always happy to help.