Report suffering from "Failed to generate preview" error. Wondering how to fix

Last week on Friday I noticed Preview does not work on the report I've been developing.

Developer console reports:

main.89abf7e4.js:2 Job failed. Job quit without result.
b @ main.89abf7e4.js:2
r.onmessage @ main.89abf7e4.js:2
main.89abf7e4.js:2 Uncaught (in promise) Error: Job failed.
    at b (main.89abf7e4.js:2:80482)
    at r.onmessage (main.89abf7e4.js:2:79444)
b @ main.89abf7e4.js:2
r.onmessage @ main.89abf7e4.js:2
main.89abf7e4.js:2 {results: Array(2), log: {…}}
main.89abf7e4.js:2 Job failed. Job quit without result.
b @ main.89abf7e4.js:2
v @ main.89abf7e4.js:2
await in v (async)
g @ main.89abf7e4.js:2
await in g (async)
Ue.handlePreviewRun @ dx.13c3b91f.chunk.js:1
await in Ue.handlePreviewRun (async)
We @ main.89abf7e4.js:75
Ke @ main.89abf7e4.js:75
(anonymous) @ main.89abf7e4.js:75
jr @ main.89abf7e4.js:75
Or @ main.89abf7e4.js:75
(anonymous) @ main.89abf7e4.js:75
De @ main.89abf7e4.js:75
(anonymous) @ main.89abf7e4.js:75
Lr @ main.89abf7e4.js:75
Qt @ main.89abf7e4.js:75
Yt @ main.89abf7e4.js:75
t.unstable_runWithPriority @ main.89abf7e4.js:75
Vo @ main.89abf7e4.js:75
Me @ main.89abf7e4.js:75
Xt @ main.89abf7e4.js:75
dx.13c3b91f.chunk.js:1 Failed to generate preview. See https://mapsdev.brucecounty.on.ca/Geocortex/Reporting/service/job/logs?ticket=eyJhbGciOiJIUzI1NiIsImtpZCI6IjAyYWQ5ODQ5ZjU1ZjQxZmRhOTc2NTE0NDdkMTJlMjE1IiwiemlwIjoiREVGIn0.NclNCsIwEAbQu3y4DNg0k5_J1pWuvUDSJlCFpOCASundRcHtexum3hA3HOS9FkRcnnJdpnuRU29SmkDh1vN5_lbPD3ckdjXlxGMdLaXqw2z8QL5oPSTDtmJXWJIgahcoWKMtsQ4K5bX-jfhn-wc.-8_we6S6UF-pNpajnuByktGEJbEdZKf0uLRL4Dk-Qqw.

I've tried removing the latest elements added to the report, but that made no difference. The previous versions of the same report from earlier stages of development also fail in the same way.

How might I get past this, please?

Thanks,
Justin