> For the complete documentation index, see [llms.txt](https://docs.daylite.app/help/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.daylite.app/help/center/process-itip-failed-error-when-adding-a-calendar-invite.md).
# "Process iTIP Failed" Error When Adding a Calendar Invite
When you attempt to add a calendar invite into Daylite, you may see the following error message indicating that Daylite is unable to import the ICS file from the invite email.
### Verify the Invite Was Sent to a Matching Email Address
The most common cause of this error is a mismatch between the email address the invite was sent to and the email address stored in your Daylite Contact record.
1. In your mail application, check the email address listed in the **To** field of the invite.
2. Open your Contact record in Daylite and confirm that the same email address appears on your Contact card.
3. If the address does not match, add it to your Daylite Contact card, then try adding the invite again.
### Invite Responses Cannot Be Processed
If the email is a response to an invite you sent (for example, an acceptance or decline from a client), Daylite cannot process it. Response ICS files use a different format than the original invite, and Daylite does not support importing them.
This is expected behavior and does not require a fix.
### Differences in ICS File Types
Calendar applications create different types of ICS files depending on how the event was shared. Daylite can only process certain types.
Daylite processes external meeting invites (called REQUEST files) that include invitees with email addresses matching Daylite users. If the ICS file is a REQUEST with no attendees, Daylite cannot process it because there is no Daylite user to accept the invitation.
{% hint style="info" icon="lightbulb" %}
**REQUEST vs. PUBLISH**
When a calendar event is exported from Apple Calendar using **File** > **Export**, the resulting ICS file becomes a PUBLISH file, which describes an event without inviting anyone. Daylite can import PUBLISH files and automatically assigns the current user as the invitee.
However, if the event was shared from Apple Calendar using **File** > **Send Email**, the file remains a REQUEST with no attendees, and Daylite cannot import it.
{% endhint %}
If the issue persists after checking the steps above, [contact support](mailto:support@daylite.app?subject=Process%20iTIP%20Failed%20Error) for further assistance.
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