Salesforce Apex Trigger Error: Cannot Handle Batch Operations on Recurring Events When Using Data Loader

Why This Happens

This is a platform limitation for Apex triggers on recurring events. The trigger cannot process a batch containing multiple recurring event types simultaneously. The trigger's logic must be separated so it does not receive a batch containing more than one recurring event type at a time. This handling must be performed outside the trigger — typically at the data loading level.

Workarounds

Use one or more of the following workarounds to successfully load recurring event records:
Workaround 1: Set Data Loader Batch Size to 1 for Recurring Events Set the batch size in Data Loader to 1 when loading recurring event records. This ensures each batch sent to Salesforce contains only one recurring event, preventing the trigger from receiving a multi-record batch of recurring events.
Workaround 2: Separate Recurring and Non-Recurring Records If there are a large number of records and loading with batch size 1 is too slow, separate the recurring event records from the non-recurring event records into two separate files. Load the recurring event records using Data Loader with batch size 1. Load the non-recurring event records separately using a higher batch size.
Workaround 3: Handle Batch Separation in the Trigger Ensure that the Apex trigger does not receive a batch containing more than one recurring event type. Add logic outside the trigger — for example, in your data preparation process — to pre-separate recurring and non-recurring events before they are sent to the API.