How to fix the „Strict Standards: Declaration of TGM_Bulk_Installer_Skin“ error?

The combination of an outdated theme and a PHP conversion can result in the following error message:

Strict Standards: Declaration of TGM_Bulk_Installer_Skin::before() should be compatible with Bulk_Upgrader_Skin::before($title = '') in /wp-content/themes/xxx/inc/class-tgm-plugin-activation.php on line 1893
Strict Standards: Declaration of TGM_Bulk_Installer_Skin::after() should be compatible with Bulk_Upgrader_Skin::after($title = '') in /wp-content/themes/xxx/inc/class-tgm-plugin-activation.php on line 1893

Solution: To do this, two lines of code must be changed, but the line number can be different, here you should use the search function.

In line 1977 you change the code

public function before() {

to

public function before( $title = '' ) {

And in line 1999:

public function after() {

to

public function after( $title = '' ) {
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Just a Web-Developer

Creating a developer’s own website is always a big challenge. You want to integrate all the cool features and show all your skills. Therefore, it is rather called here to make cutbacks and to put the information in the foreground. I hope this is halfway successful here.
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A few years ago I had the idea for a photo project. I wanted to photograph crime scenes from the Ruhr region and show how these places look today. During the Corona Pandemic 2021, I started taking the photos and at the beginning of 2022, I started implementing the corresponding website.

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CMS Geek was a website project that I started in 2018 and was supposed to introduce users to the functions of WordPress through explanatory videos. In addition to a blog that informed about the latest news about WordPress and Joomla, there were also helpful code solutions to common WordPress, html and CSS problems.

Due to the lack of time to produce more explainer videos, I discontinued this project in spring 2023. I have taken over the code snippets for Just-a-Web-Developer, updated them and will continue to expand them.