An error occurred while displaying this card - v0.40.5

Our slack integration notifications are no longer working
I've also tried testing email notifications and receive the following error:

Here's my diagnostic info, I've upgraded to the most recent version but things are still broken.
"browser-info": {
"language": "en-US",
"platform": "MacIntel",
"userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36",
"vendor": "Google Inc."
"system-info": {
"file.encoding": "UTF-8",
"": "OpenJDK Runtime Environment",
"java.runtime.version": "11.0.12+7",
"java.vendor": "Eclipse Foundation",
"java.vendor.url": "",
"java.version": "11.0.12",
"": "OpenJDK 64-Bit Server VM",
"java.vm.version": "11.0.12+7",
"": "Linux",
"os.version": "5.4.109+",
"user.language": "en",
"user.timezone": "GMT"
"metabase-info": {
"databases": [
"hosting-env": "unknown",
"application-database": "postgres",
"application-database-details": {
"database": {
"name": "PostgreSQL",
"version": "9.6.22"
"jdbc-driver": {
"name": "PostgreSQL JDBC Driver",
"version": "42.2.18"
"run-mode": "prod",
"version": {
"date": "2021-09-21",
"tag": "v0.40.5",
"branch": "release-x.40.x",
"hash": "042a36e"
"settings": {
"report-timezone": null

Hi @carldavidson
Okay, so it has nothing to do with 0.40.5, since it didn't work before. Which version where you using?
Check the full detailed error in Admin > Troubleshooting > Logs.