callback error: Plugin generating an incompatibility

Question

I am making a site in wordpress and I am using 2 plugins company: Optimizepress and Timeline Express, the problem is that Timeline Express is generating a callback error and that prints an error on the page in question.

The error: Warning: call_user_func_array() expects Parameter 1 to be a Valid callback, Second array Member is not a Valid method in /home/comovendersoftware/www/wp-includes/class-wp-hook.php on line 286

The site: http://comovendersoftware.com.br/

Error code

do {
        $this->current_priority[ $nesting_level ] = $priority = current( $this->iterations[ $nesting_level ] );

        foreach ( $this->callbacks[ $priority ] as $the_ ) {
            if ( ! $this->doing_action ) {
                $args[0] = $value;
            }

            // Avoid the array_slice if possible.
            if ( $the_['accepted_args'] == 0 ) {
                $value = call_user_func_array( $the_['function'], array() );
            } elseif ( $the_['accepted_args'] >= $num_args ) {
                $value = call_user_func_array( $the_['function'], $args );
            } else {
                $value = call_user_func_array( $the_['function'], array_slice( $args, 0, (int) $the_['accepted_args'] ) );
            }
        }
    } while ( false !== next( $this->iterations[ $nesting_level ] ) );

Being error line 286:

$value = call_user_func_array( $the_['function'], $args );

I ended up not finding many answers to this, besides that this error is not disturbing anything in the design or usability of the site, I tried to use the WP Debugs as false not to print, but also not rolled.