AnyConnect Package on the secure gateway could not be located

This error message is because your Cisco ASA doesn’t have the AnyConnect image for your WebVPN profile. These images can be downloaded from cisco.com .This example is for ASDM 7.6, but if you run version 6.x you can do using ASDM Configuration > Remote Access VPN > Network (Client) Access > AnyConnect Customization/Localization > Binary