I think this is because your images are too small – can you try a test and upload a much larger image and see if this solves it?
Please report back… if this is confirmed bug I can fix it in the plugin…
Sorry, i’m french and my english is very bad ! 🙂
I have the same error message and another issue.
I don’t see the parameter in admin (only upload button and images)
When i have install the plugin all were OK.
I have change all parameters (number of images, background color, slider width…)
because we can’t change the images order i have delete 2 images … and now i have this error message and the parameter have disappeared !
I have try to delete and install again the plugin but i have alway the same issues.
For the parameter i have try to change it in logo-slider.php with the editor but i have the same error message when i try to upload my images.
I tried different images sizes, and always the same error message
…
Warning: basename() expects parameter 1 to be string, object given in /homepages/41/d391744853/htdocs/wp-content/plugins/logo-slider/logo-slider.php on line 159
…
Please help !