I'm getting this error when trying to enter the Extension Manager:

{
  "header": {
    "status": {
      "code": "ERROR"
    },
    "message": "An nlobjSearchColumn contains an invalid column, or is not in proper syntax: custrecord_extension_sub_type.",
    "extra_data": {},
    "error_code": "SSS_INVALID_SRCH_COL"
  }
}

Any idea what's happening?

I’ve experienced this issue before. Strangely it went away on its own after some time.

I have reinstalled the SuiteCommerce Extension Management Bundle and the error disappeared.