Analytics error codes

Error Code	Cause	Value	Result
2	Event name is invalid (empty, too long, invalid characters)	Name of the invalid event	The event is ignored and a firebase_error event is logged with a firebase_error_value parameter which indicates the invalid event name.
3	Event parameter name is invalid (empty, too long, invalid characters)	Name of the invalid parameter	The event parameter is replaced with a firebase_error parameter (one per event) and a firebase_error_value parameter is added to indicate the invalid parameter name.
4	Event parameter value is too long	Name of invalid parameter	The invalid parameter is dropped. A firebase_error parameter is added to the event and a firebase_error_value parameter is added to indicate the name of the parameter with the invalid value.
5	Event has more than 25 parameters	None	Extra event parameters are dropped. A firebase_error parameter is added to the event with the value of the error code.
6	User property name is invalid (empty, too long, invalid characters)	Name of invalid property.	The user property change is ignored. A firebase_error event is logged with a firebase_error_value parameter which indicates the invalid user property name.
7	User property value is too long	Name of invalid property.	The user property change is ignored. A firebase_error event is logged with a parameter whose value indicates the name of the invalid user property value.
8	App Instance logs more than 500 unique event types	None	Extra events are dropped. A firebase_error event is logged with a firebase_error parameter which indicates the error code.
9	App Instance sets more than 25 unique user properties	None	The user property change is ignored. A firebase_error event is logged with a firebase_error parameter which indicates the error code.
10	App Instance exceeds conversion event limit in a single day	None	Event is logged as a normal (i.e. non-conversion) event. A firebase_error parameter is added to the event with the value of the error code.
11	App Instance logs blacklisted event	Name of blacklisted event	Event is ignored. A firebase_error event is logged with a firebase_error_value parameter which indicates the blacklisted event name.
12	App Instance sets blacklisted user property.	Name of blacklisted user property.	The user property change is ignored. A firebase_error event is logged with a firebase_error_value parameter which indicates the blacklisted user property.
13	Event name is reserved	Name of reserved event.	Event is ignored. A firebase_error event is logged with a firebase_error_value parameter which indicates the invalid event name.
14	Event parameter name is reserved.	Name of reserved parameter.	Event parameter is replaced with a firebase_error parameter with the value of the error code. A firebase_error_value parameter is added to indicate the reserved parameter name.
15	User property name is reserved	Name of reserved user property	The user property change is ignored. A firebase error event is logged with a firebase_error_value parameter which indicates the invalid user property name.
17	Parameter array length exceeds limit (200)	Name of truncated parameter array (value)	The array parameter is truncated to 200 items. A firebase_error parameter is added to the event (one per event) with the value of the error code. A firebase_error_value parameter is added to indicate the name of the truncated parameter.
18	Invalid value parameter type	Name of invalid parameter (value)	The value parameter is dropped. A firebase_error parameter is added to the event and a firebase_error_value parameter is added to indicate the name of the parameter with the invalid type (value).
19	Missing currency parameter on a conversion event	Name of invalid parameter (value)	The value parameter is dropped. A firebase_error parameter is added to the event and a firebase_error_value parameter is added to indicate the name of the invalid parameter (value).
20	Event array parameter name is invalid	Name of invalid parameter (value)	The event parameter is replaced with a firebase_error parameter (one per event) and a firebase_error_value parameter is added to indicate the invalid parameter name.
21	Event does not support array parameters	Name of the invalid event	The event parameter is replaced with a firebase_error parameter (one per event) and a firebase_error_value parameter is added to indicate the invalid event name.
22	Item cannot contain an array-based parameter	Name of invalid parameter (value)	The nested array parameter is replaced with a firebase_error parameter (one per param) and a firebase_error_value parameter is added to indicate the invalid param name.
23	Item cannot contain custom parameters	None	Custom array parameters are dropped. Add a firebase_error parameter with the value of the error code.
25	Item array not supported on client's version of Google Play Services (Android Only)	None	Array parameters are dropped. Add a firebase_error parameter with the value of the error code.
28	Item has more than 27 custom parameters	None	Extra item parameters are dropped. A firebase_error parameter is added to the item with the value of the error code.