ExampleUID1.ics already exists. UID not unique?

[jamesinger]

Error as below - Any idea whyit does this ?, same error from first try to 40th

Exception: http://mail.liquidflameit.co.nz:2079/rpc/calendars/[email protected]/calendar:0778f0b0-62fe-57b8-089c-afafb6029493/ExampleUID1.ics already exists. UID not unique?

For debugging purposes:

last request:

GET /rpc/calendars/[email protected]/calendar:0778f0b0-62fe-57b8-089c-afafb6029493/ExampleUID1.ics HTTP/1.1
Authorization: Basic amFtZXNAbGlxdWlkZmxhbWVpdC5jby5uejpXM2ludGVyMDA=
User-Agent: cURL based CalDAV client
Host: mail.liquidflameit.co.nz:2079
Accept: /
Content-type: text/xml
Depth: 1

last response:

HTTP/1.1 200
Date: Tue, 24 Jan 2017 01:54:03 GMT
Server: cPanel
Persistent-Auth: false
Host: mail.liquidflameit.co.nz:2079
Cache-Control: no-cache, no-store, must-revalidate, private
Connection: Keep-Alive
Pragma: no-cache
Accept-Charset: UTF-8
Vary: Accept-Encoding
Content-Length: 427
Content-Type: text/xml;charset=UTF-8
Expires: Fri, 01 Jan 1990 00:00:00 GMT
Set-Cookie: Horde=466fr75vuj4kp8kvgoek33jus4; path=/; domain=mail.liquidflameit.co.nz; HttpOnly
Set-Cookie: horde_secret_key=466fr75vuj4kp8kvgoek33jus4; path=/; domain=mail.liquidflameit.co.nz; httponly
Set-Cookie: default_horde_view=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/; domain=mail.liquidflameit.co.nz
X-Powered-By: PHP/5.6.20

Trace:

#0 /home/liquidfl/apps.liquidflameit.co.nz/ess/html/caldav/example code/example.php(139): SimpleCalDAVClient->create('BEGIN:VCALENDAR...')
#1 {main}