1-Click-Upgrade produces blank screen

[aeneas]

 

Whenever I install the module "1-Click-Upgrade" I get a blank screen in my browser with the URL saying ".../index.php?tab=AdminSelfUpgrade&token=..." with some number after the equals sign.

When I go back to the Dashboard, it appears the module has been installed. However when I click on the "1-Click-Upgrade" (in "Advanced") or enter the settings to the module (in "Modules") I get the blank screen again.

Enabling error logging yields the following result (note: full paths redacted)

Fatal error: Uncaught Error: Call to undefined method AdminSelfUpgrade::displayErrors() in /admin/functions.php:281
Stack trace:
#0 /admin/functions.php(422): checkingTab('AdminSelfUpgrad...')
#1 /classes/Dispatcher.php(347): runAdminTab('AdminSelfUpgrad...', false)
#2 /admin/index.php(58): DispatcherCore->dispatch()
#3 {main} thrown in /admin/functions.php on line 281

Versions:

Prestashop 1.6.18 (would have upgraded sooner if above works)
1-Click-Upgrade v4.4.2

PHP-Version 7.0.32
MySQL-Version 5.5.60-0+deb7u1-log
memory_limit=256M
max_execution_time=120
max_input_time=120
upload_max_filesize=64M
post_max_size=64M

Thanks for any advice on how to fix this.

Edited November 23, 2018 by aeneas
correction (see edit history)

[joseantgv]

Do you have the last version of 1-click upgrade module?

[aeneas]

On 11/23/2018 at 6:18 PM, joseantgv said:

Do you have the last version of 1-click upgrade module?

 

On 11/23/2018 at 4:01 PM, aeneas said:

Versions:

Prestashop 1.6.18 (would have upgraded sooner if above works)
1-Click-Upgrade v4.4.2

https://addons.prestashop.com/en/data-migration-backup/5496-.html

Current version: 4.4.2 (11/20/2018)

 

[aeneas]

I found out what the problem was: I was logged in as an "Admin" not a "SuperAdmin". So it was a "missing rights"-issue. Now it worked.

Still: There should be a more specific feedback instead of just a blank screen. 😄