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I copied the contents of the file from classes/dynamic_price_updater.php from
...

Is this version of this module GitHub
https://github.com/Zen4All-nl/Zen-Cart-Dynamic-Price-Updater/releases/tag/v3.1

Same as this one
https://www.zen-cart.com/downloads.php?do=file&id=1301 ?
...

Now got one more warning

[18-Jul-2017 06:57:14 UTC] Request URI: /ajax.php?act=DPU_Ajax&method=dpu_update, IP address: 192.168.200.28
#1 DPU->removeExtraSelections() called at...

It appears using your file has fixed the problem!

Thanks a lot :)
Much appreciated!

here is a complete log file

[17-Jul-2017 09:57:47 UTC] Request URI: /ajax.php?act=DPU_Ajax&method=dpu_update, IP address: 192.168.200.28
#1 header() called at...

I just checked and there is no character at the opening

<?php

class zcDPU_Ajax extends base
{
function dpu_update()

What else could be the reason for this?

Hello,

I upgraded a client's website to the latest version 1.5.5e
I installed Dynamic Price Updater module but it keeps sending the following warning in the logs

@Dr Byte kindly help
...