Joomla 4 EIR error + plugin settings cannot be changed

Hi,

When editing a page with rsjoomla sp pagebuilder pro an error is visible on top of the page.

Warning: Undefined array key "extension" in /var/www/vhosts/[domainname]//plugins/system/easyimageresizer/src/Helper/EasyImageResizerHelper.php on line 619

Looking at that line in the code I think it is nothing I can update or change myself.
What can go wrong here?

Other issue : dashboard > plugins > EIR
I want to change the plugin settings, because the default image width = 1000 and needs to be larger.
The EIR settings form is visible above the admin header and an error is also visible
Call to undefined function Joomla\CMS\Http\Transport\curl_exec()

Does this sound familiar and what can I do to make it work well?
Thank you for your help

Regards,
Ronald

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