Invalid parameter value detected

Invalid parameter value detected

by wahid Anwar -
Number of replies: 1

I have this message when i open the chat activity

invalidparameter
Invalid parameter value detected

 and when i turn on the debugging mode i see the next log error

File: /lib/externallib.php
Line: 332
Stack trace:

Missing required key in single structure: year
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()


my moodle version is 3.7

and i try it with  the all theme

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