I am suddenly seeing a popup error entitled "invalidparameter" with the text "Invalid parameter value detected". I have to click the "close" three times to finally get it to go away.
Here is the stack trace (from: /lib/externallib.php, line 332)
lang => Invalid parameter value detected: Invalid external api parameter: the value is "en_us", the server was expecting "lang" type
Error code: invalidparameter
* line 332 of /lib/externallib.php: invalid_parameter_exception thrown
* line 223 of /lib/externallib.php: call to external_api::validate_parameters()
* line 59 of /lib/ajax/service.php: call to external_api::call_external_function()
* line 31 of /lib/ajax/service-nologin.php: call to require_once()
I'm not using an API, it's just a course with a single topic. The course has one activity which is a link to a video located in AWS CloudFront.