Ajax issues

After installing W3 Total Cache and using defaults. I am getting a number of Ajax errors. This is just one of them. I’ve pasted it to the end of this note.

Did I miss something that is causing this?

Thanks

Paul

=============================================================================?
jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
edit.php:1 [DOM] Found 2 elements with non-unique id #update-folder-item-name: (More info: https://goo.gl/9p2vKq)

query-monitor.js:366 PHP Errors in Ajax Response
query-monitor.js:376
Object
component: “Unknown”
file: “wp-content/plugins/w3-total-cache/Cache_File.php”
key: “e9e2c93031b8606460a678c702291e5b”
line: 169
message: “unpack(): Type L: not enough input, need 4, have 0”
stack: []
type: “warning”
__proto__: Object
query-monitor.js:366 PHP Errors in Ajax Response
query-monitor.js:379
Object
component: “Unknown”
file: “wp-content/plugins/w3-total-cache/Cache_File.php”
key: “9478db2868f57c6aaf823ba2e100f0c5”
line: 138
message: “unserialize(): Error at offset 370443 of 1024000 bytes”
stack: []
type: “notice”
__proto__: Object
query-monitor.js:366 PHP Errors in Ajax Response
query-monitor.js:379
Object
component: “Unknown”
file: “wp-content/plugins/w3-total-cache/Cache_File.php”
key: “2d1174558f0de69cc59194e52250a12a”
line: 138
message: “unserialize(): Error at offset 370443 of 794606 bytes”
stack: []
type: “notice”
__proto__: Object

The page I need help with: [log in to see the link]