Cannot modify header information - headers already sent by

[Frankiemo]

I installed hivepress using the expertpress theme. I am getting three different warnings as seen below:
Warning : Cannot modify header information - headers already sent by (output started at /home3/prohelpn/example.com/wp-content/plugins/hivepress/includes/queries/class-query.php:19) in /home3/prohelpn/example.com/wp-admin/includes/misc.php on line 1431

Additionally, I am getting a Deprecated warning as seen below.
Deprecated : Return type of HivePress\Queries\Query::serialize() should either be compatible with ArrayObject::serialize(): string, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home3/prohelpn/example.com/wp-content/plugins/hivepress/includes/queries/class-query.php on line 532

None of these warnings were present until I installed the additional plugins that follow the first one. I tried using a plugin to reset my wordpress site to it’s initial state and removed all plugins, etc… That was successful but upon uploading the Hivepress plugins again, the warnings all come back.

Can anyone help?

[andrii]

Hi,

Please provide more details. Do you have WP_DEBUG enabled? What version of PHP do you have? Also, please disable third-party plugins and customizations (if there are any) and check if this issue persists. If you use a caching plugin, ensure that caching is disabled for logged-in users. As an alternative, I recommend checking the PHP logs and sending them to us, as they will provide more details: How to configure WordPress error logs to identify and resolve problems - HivePress Help Center

[Frankiemo]

I just had my hosting company wipe my site clean and I started again. No issues anymore. I think there were some bad plugins that were not working well with Hivepress. Issue solved.

[Frankiemo]

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