You must load the server certificates on the SRX Series device and configure the servers to use the SSL proxy function on the SRX Series device. This is done to ensure that the SSL proxy is able to decrypt the traffic between the client and server. Additionally, you must import the root CA on the servers in order for the SSL proxy to properly validate the server certificate.

AppTrack is a feature of Juniper Networks firewall solutions that allows administrators to track applications, users, and the amount of traffic generated by those applications on the network.
AppTrack can be enabled on specific security zones of the network to monitor traffic on those zones. This feature can be used to determine how much traffic a popular gaming application is generating on the network.
AppTrack is a feature of the Junos OS that provides visibility into the applications and users on your network. It tracks the usage of applications and provides detailed reports on the amount of traffic generated by each application. By enabling AppTrack on the proper security zones, you can determine how much traffic a popular gaming application is generating on your network.

The error message indicates that the Junos-http application is not defined, so you need to either create a custom application or modify the security policy to use the built-in Junos-http application.
Doing either of these will allow you to successfully commit the configuration.