errors after installing plugin

  • Hi, after installing a plugin, whenever I try to save a setting I get this message.

    In this instance it relates to DecisionTree

    Warning: Missing argument 2 for DecisionTree::on_update_idonated() in /home/iasservicesorg/public_html/wp-content/plugins/sidecar-decision-tree/DecisionTree.php on line 407

    Warning: Cannot modify header information – headers already sent by (output started at /home/iasservicesorg/public_html/wp-content/plugins/sidecar-decision-tree/DecisionTree.php:407) in /home/iasservicesorg/public_html/wordpress/wp-includes/pluggable.php on line 1179

    When I try to view the page/tree I created I get a 404

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