Cannot upload picture concrete5 PHP7.1

I want to try an old concrete5 with PHP7.1 to test how the element "slideshow" is called in this version.
To try out the slideshow block I have to upload an picture, but it is not possible because I get this error during upload:
    Declaration of Carbon\Carbon::setTime($hour, $minute, $second = 0) should be compatible with DateTime::setTime($hour, $minute, $second = NULL, $microseconds = NULL)

Maybe wrong PHP version?
Where can I find out which version is necessary for

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johannesri replied on at Permalink Best Answer Reply
It seems like this old version is not working with PHP 7.1. I was able to upload picture with PHP7.0
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