call_user_func_array error on Checkout

The site is http://www.thedenier.com

Running jigoshop 1.13.3 and Jigoshop Fedex Plugin 2.2.7.

Users are getting this error when they click on “Place Order” for PayPal :

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘jigoshop_new_order_notification’ not found or invalid function name in /home/thedenie/public_html/wp-includes/plugin.php on line 505
{“result”:”success”,”redirect”:”http:\/\/thedenier.com\/checkout\/pay\/?key=order_5480e38342968&order=877″}

Happens no matter what shipping method is selected (I’ve tested them all).

While this error is being displayed in the cart, if the user clicks the ‘Place Order’ button again, it goes through to PayPal no problem.

here is the system information

### Begin System Info ###

	Multi-site:               No

	SITE_URL:                 http://thedenier.com
	HOME_URL:                 http://thedenier.com

	Jigoshop Version:         1.13.3
	WordPress Version:        4.0.1

	Platform:                 Windows
	Browser Name:             Chrome
	Browser Version:          39.0.2171.71
	User Agent String:        Mozilla/5.0 (Windows NT 6.1; WOW
                                  64) AppleWebKit/537.36 (KHTML, l
                                  ike Gecko) Chrome/39.0.2171.71 S
                                  afari/537.36

	PHP Version:              5.4.34
	MySQL Version:            5.1.73
	Web Server Info:          Apache

	eAccelerator:             Disabled
	APC:                      Disabled
	OpCache:                  Disabled

	PHP Memory Limit:         256M
	PHP Post Max Size:        24MB
	PHP Upload Max File Size: 32MB
	PHP Max Input Time:       60
	PHP Max Input Vars:       1000
	WordPress Memory Limit:   128MB

	Short Open Tag:           Enabled
	Allow URL fopen:          Enabled

	WP_DEBUG:                 Disabled
	WP Table Prefix:          Length: 3 Status: Acceptable

	Show On Front:            page
	Page On Front:            30
	Page For Posts:           0

	Session:                  Enabled
	Session Name:             PHPSESSID
	Cookie Path:              /
	Save Path:                /tmp
	Use Cookies:              On
	Use Only Cookies:         On

	DISPLAY ERRORS:           On (1)
	FSOCKOPEN:                Supported

	ACTIVE PLUGINS:

	Backup: 2.2
	Better WordPress Google XML Sitemaps: 1.3.1
	Blog Icons: 0.5.1
	Hana Flv Player: 3.1.3
	Jigoshop: 1.13.3
	Jigoshop FedEx Shipping Method: 2.2.7
	jQuery Updater: 2.1.1
	Official StatCounter Plugin: 1.6.9
	WP-Mail-SMTP: 0.9.5
	YouTube: 9.2

	CURRENT THEME:

Headway: 2.0.13

	### End System Info ###

https://ww.wp.xz.cn/plugins/jigoshop/