# Matomo + Piwik Pro in parallel - Cookie Problem

**URL:** <https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368>\
**Category:** Data collection and tags\
**Created:** [June 14, 2023, 4:07pm UTC](https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368 "2023-06-14T16:07:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![alexaddismap](https://dub1.discourse-cdn.com/flex005/user_avatar/community.piwik.pro/alexaddismap/32/1917_2.png) [@alexaddismap](https://community.piwik.pro/u/alexaddismap)\
**Post date:** [June 14, 2023, 4:07pm UTC](https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368/1 "2023-06-14T16:07:43Z")

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I followed the steps in [https://help.piwik.pro/support/questions/can-i-use-piwik-pro-and-matomo-at-the-same-time/](https://help.piwik.pro/support/questions/can-i-use-piwik-pro-and-matomo-at-the-same-time/) to setup PiwikPro in parallel with Matomo (Method 1).

Both, PiwikPro and Matomo are configured to not set visitor cookies.

I am getting

Error message: Cookie cookie ID (\_id) parameter has incorrect length (value: ‘’, correct length: 16)

In the tracker debugger for most of the entries.

Can anyone make sense of this error message?

Page is [www.addismap.com](http://www.addismap.com)

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**Author:** ![asinior](https://dub1.discourse-cdn.com/flex005/user_avatar/community.piwik.pro/asinior/32/1905_2.png) [@asinior](https://community.piwik.pro/u/asinior)\
**Post date:** [June 15, 2023, 7:48am UTC](https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368/2 "2023-06-15T07:48:42Z")

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Hi,  
Could you please send me a screenshot of the the error message that you are getting?  
You can either leave it under this thread or dm me if you prefer to.

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**Author:** ![alexaddismap](https://dub1.discourse-cdn.com/flex005/user_avatar/community.piwik.pro/alexaddismap/32/1917_2.png) [@alexaddismap](https://community.piwik.pro/u/alexaddismap)\
**Post date:** [June 15, 2023, 8:41am UTC](https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368/4 "2023-06-15T08:41:12Z")

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currently I cannot find any such occurrences any more in the tag debugger …

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<div class="post-metadata">

**Author:** ![asinior](https://dub1.discourse-cdn.com/flex005/user_avatar/community.piwik.pro/asinior/32/1905_2.png) [@asinior](https://community.piwik.pro/u/asinior)\
**Post date:** [June 15, 2023, 9:02am UTC](https://community.piwik.pro/t/matomo-piwik-pro-in-parallel-cookie-problem/2368/5 "2023-06-15T09:02:47Z")

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No worries, let me know if the issue reemerges.