Errors after upgrade

[miele]

I'm getting the following error when trying to modify the fields of a catalog:

Warning: getimagesize() [function.getimagesize]: Read error! in /home/degrooteavelgem/default_www/system/libraries/Controller.php on line 1958
#0 [internal function]: __error(2, 'getimagesize() ...', '/home/degrootea...', 1958, Array)
#1 /home/degrooteavelgem/default_www/system/libraries/Controller.php(1958): getimagesize('/home/degrootea...')
#2 /home/degrooteavelgem/default_www/system/modules/catalog/dca/tl_catalog_fields.php(508): Controller->generateImage(NULL, 'Type', 'title="Type: "')
#3 /home/degrooteavelgem/default_www/system/drivers/DC_Table.php(3484): tl_catalog_fields->renderField(NULL)
#4 /home/degrooteavelgem/default_www/system/drivers/DC_Table.php(345): DC_Table->parentView()
#5 /home/degrooteavelgem/default_www/system/modules/backend/Backend.php(234): DC_Table->showAll()
#6 /home/degrooteavelgem/default_www/contao/main.php(101): Backend->getBackendModule('catalog')
#7 /home/degrooteavelgem/default_www/contao/main.php(304): Main->run()
#8 {main}


Warning: Cannot modify header information - headers already sent by (output started at /home/degrooteavelgem/default_www/system/functions.php:134) in /home/degrooteavelgem/default_www/system/libraries/Template.php on line 186
#0 [internal function]: __error(2, 'Cannot modify h...', '/home/degrootea...', 186, Array)
#1 /home/degrooteavelgem/default_www/system/libraries/Template.php(186): header('Content-Type: t...')
#2 /home/degrooteavelgem/default_www/system/modules/backend/BackendTemplate.php(142): Template->output()
#3 /home/degrooteavelgem/default_www/contao/main.php(295): BackendTemplate->output()
#4 /home/degrooteavelgem/default_www/contao/main.php(104): Main->output()
#5 /home/degrooteavelgem/default_www/contao/main.php(304): Main->run()
#6 {main}

I have updated all modules, and I suppose this is causing the errors. I'm on contao version 2.9.1
I already tried adapting the template, but to no avail.

Any tips on what I could try next to solve this problem?

Best regards,

Miele

[miele]

When checking the catalog field definitions, I see that a lot of fields have disappeared. Probably this is causing the error...
Anyone has any ideas of why this happened after upgrading the extension module?