Code errors

I've just installed betheme.zip and I see on the top both wordpress dashboard and public website the following errors:
Could you help me to fix them, please? What's wrong?
Thank you
Marc

Warning: Invalid argument supplied for foreach() in /home/urban/domains/urbanrecreativas.com/public_html/wp-content/plugins/LayerSlider/classes/class.ls.sources.php on line 163

Warning: Cannot modify header information - headers already sent by (output started at /home/urban/domains/urbanrecreativas.com/public_html/wp-content/plugins/LayerSlider/classes/class.ls.sources.php:163) in /home/urban/domains/urbanrecreativas.com/public_html/wp-includes/option.php on line 772

Warning: Cannot modify header information - headers already sent by (output started at /home/urban/domains/urbanrecreativas.com/public_html/wp-content/plugins/LayerSlider/classes/class.ls.sources.php:163) in /home/urban/domains/urbanrecreativas.com/public_html/wp-includes/option.php on line 773

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