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I'm getting errors in sitemap_index.xml which is xml generated by Yoast plugin.

Below is the error that I'm getting:

This page contains the following errors:

error on line 2 at column 6: XML declaration allowed only at the start of the document
Below is a rendering of the page up to the first error.

I know that there is a whitespace and I had a look at functions.php and other files but they all seem normal without any extra actions triggering whitespaces at the top.

I could probably disable and enable one plugin one by one and try it that way but is unsure whether this is a good option as there is a rist involved in losing plugin configurations or any setups done on the plugins when deactivated.

Does anyone have any suggestions?

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Your feeling is correct. You need to debug this and the place to start is with disabling plugins and switching to the default theme. – s_ha_dum Jan 4 at 14:47
can you show us the actual xml? – adrian7 Jan 6 at 14:00

closed as too localized by toscho♦ Feb 9 at 11:56

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