Constant lv2_sys::LV2UI_Request_Value_Status_LV2UI_REQUEST_VALUE_ERR_UNKNOWN

pub const LV2UI_Request_Value_Status_LV2UI_REQUEST_VALUE_ERR_UNKNOWN: LV2UI_Request_Value_Status = 2;

Unknown parameter.

The host is not aware of this parameter, and is not able to set a new value for it.