botocoreexceptionsParamValidationError Parameter validation failedInvalid type for parameter eventList0itemId value None type class NoneType valid types class strInvalid type for parameter eventList0p

This error occurs because the parameter itemId in eventList[0] is expected to be a string, but it is being passed as None. Similarly, the parameter properties in eventList[0] is expected to be a string, but it is being passed as a dictionary.

To fix this error, you need to ensure that the itemId is a string and the properties are also passed as a string. You can convert the itemId to a string and the properties to a JSON string before making the API call.