Error when installed

  • We’ve just upgraded our store and every time we try to add a product to the cart we receive the following issue.

    Warning: Cannot modify header information - headers already sent by (output started at [serverpath]/wp-content/plugins/mwp-herd-effect/admin/admin.php:25) in [serverpath]/wp-includes/pluggable.php on line 1179

    Any advice?

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