Plugin Error And How to Solve it

Whenever i want to install a wordpress plugin this message keeps showing up. I have no clue on what to do.

Warning: Attempt to modify property of non-object in /home/u842339359/public_html/wp-content/plugins/light/light.php on line 39 Warning: array_search() expects parameter 2 to be array, null given in /home/u842339359/public_html/wp-content/plugins/light/light.php on line 40 Warning: Attempt to modify property of non-object in /home/u842339359/public_html/wp-content/plugins/light/light.php on line 40 Warning: Invalid argument supplied for foreach() in /home/u842339359/public_html/wp-includes/update.php on line 275