PHP Error with Gravity Forms

  • shinylab

    (@shinylab)


    5 years ago

    I’d like to buy Sliced invoices, but I have an issue when activating the Gravity Form addon. Gravity forms works great. But when I activate the Sliced Invoice Gravity Forms addon… I get this error on all my pages (public and dashboard)

    “Warning: Declaration of Sliced_Invoices_GF::plugin_row() should be compatible with GFAddOn::plugin_row($plugin_name, $plugin_data) in…

    Warning: Cannot modify header information – headers already sent by (output started at…) in …”

    How can I resolve the issue?

    Many many Thanks

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