error instaling plugins

Anothers problems
Warning: Cannot modify header information – headers already sent by (output started at /home/myweb/public_html/wp-content/plugins/zopim-live-chat/accountconfig.php:20) in /home/miruta/public_html/wp-login.php on line 414

Warning: Cannot modify header information – headers already sent by (output started at /home/myweb/public_html/wp-content/plugins/zopim-live-chat/accountconfig.php:20) in /home/miruta/public_html/wp-login.php on line 426

Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /home/myweb/public_html/wp-content/plugins/zopim-live-chat/accountconfig.php:20) in /home/miruta/public_html/wp-content/plugins/hc-custom-wp-admin-url/hc-custom-wp-admin-url.php on line 95

same with me,

after install this new update, my wordpress show this

The plugin generated 471 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

So sorry about it, the update for this bug fix has already been rolled out. Do download the latest version.
Thank you for reporting the bug.

Regards,
Team Zopim

I am updating, thanks for support

Thanks for your patience ??