Nothing appears in the Jira Administration page for Custom Field Toolbox

Hi, we are trying to trial Custom Field Toolbox for our administration of Jira

Jira Core/SW version = 8.14.1

When I navigate to the Administration page and click the Custom Field Toolbox link, I briefly get a progress bar, and then an empty frame.

Browser developer console gives the following:

Failed to load resource: the server responded with a status of 404 ()
127batch.js?locale=en-UK:244 DEPRECATED undefined - AJS.params has been deprecated since 9.0.0 and will be removed in 10.0.0.
at Function.value (https://myURL.com/s/fe16f0cda9f88e23396a764bf14e6da1-CDN/-50vd2s/814002/8bf70e75043df5e1829c49869e53cf9b/4.3.3/_/download/batch/systems.npe.jira.cfu:entrypoint-cft_field_list/systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5:4440))
i @ batch.js?locale=en-UK:244
systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77 TypeError: Cannot read property 'toLocaleString' of undefined
at Object.content (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5
at Array.map (<anonymous>)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5
at Array.map (<anonymous>)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at Ua (systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77)
at za (systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77)
il @ systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77
systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5 Uncaught (in promise) TypeError: Cannot read property 'toLocaleString' of undefined
at Object.content (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5
at Array.map (<anonymous>)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5
at Array.map (<anonymous>)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at n.value (systems.npe.jira.cfu:entrypoint-cft_field_list.js?locale=en-UK:5)
at Ua (systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77)
at za (systems.npe.jira.cfu:split_vendors~cft_field_details~cft_field_list~cft_issue_list.js?locale=en-UK:77)

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