# Error: Unknown or bad format (PD) **URL:** \ **Category:** Product Support\ **Created:** [February 17, 2021, 12:14pm UTC](https://forum.mautic.org/t/error-unknown-or-bad-format-pd/18204 "2021-02-17T12:14:15Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![antonio-lazzari](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/antonio-lazzari/32/737_2.png) [@antonio-lazzari](https://forum.mautic.org/u/antonio-lazzari)\ **Post date:** [February 17, 2021, 12:14pm UTC](https://forum.mautic.org/t/error-unknown-or-bad-format-pd/18204/1 "2021-02-17T12:14:15Z")
**Your software** My Mautic version is: 3.2.5 My PHP version is: last supported My Database type and version is: last supported **Your problem** My problem is: the emails have apparently (as I can saw) random sending errors These errors are showing in the log: mautic.ERROR: CAMPAIGN: Determining interval scheduled failed with “DateInterval::\_\_construct(): Unknown or bad format (PD)” Any ideas guys? Thanks a lot ---
**Author:** ![Vytenis](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/vytenis/32/3856_2.png) [@Vytenis](https://forum.mautic.org/u/Vytenis)\ **Post date:** [April 28, 2021, 2:27pm UTC](https://forum.mautic.org/t/error-unknown-or-bad-format-pd/18204/2 "2021-04-28T14:27:07Z")
I can confirm this happening for us as well. PHP v 7.4.12. It happens only with scheduled campaigns. I feel it might be related to variables not being populated. But still ivnestigating ---
**Author:** ![antonio-lazzari](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/antonio-lazzari/32/737_2.png) [@antonio-lazzari](https://forum.mautic.org/u/antonio-lazzari)\ **Post date:** [February 25, 2022, 11:09am UTC](https://forum.mautic.org/t/error-unknown-or-bad-format-pd/18204/3 "2022-02-25T11:09:41Z")
Hi dear any news about this issue? I still have the same problem with 4.1.2