Fatal error … repeater.php on line 427

Hello,
today I have tried to update the plugin of envato-toolkit.
First I have updated wordpress to the newest version.
Than the update of envato-toolkit failed and now can not come into the website or wordpress, it shows me following:

Fatal error: Cannot redeclare class acf_field_repeater in /kunden/434309_10625/webseiten/wp-content/plugins/envato-wordpress-toolkit/repeater.php on line 427

What can I do to fix this problem and the website ?

Thanks a lot,
Joe

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