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When changing the order status of a cancelled order. i.e. cancelled by mistake so trying to change it to processing, it returns the following error.

[27-Oct-2017 23:28:30 UTC] PHP Fatal error: Uncaught Exception: Error: Could not load model extension/total/subtotal! in /storage1/modification/system/engine/loader.php:89
Stack trace:
#0 /public_html/k9rawfood/catalog/model/checkout/order.php(307): Loader->model('extension/total...')
#1 /storage1/modification/system/engine/loader.php(248): ModelCheckoutOrder->addOrderHistory('7661', '5', '', '0', '0')
#2 /public_html/k9rawfood/system/engine/proxy.php(47): Loader->{closure}(Array, Array)
#3 /public_html/k9rawfood/catalog/controller/api/order.php(794): Proxy->__call('addOrderHistory', Array)
#4 /storage1/modification/system/engine/action.php(79): ControllerApiOrder->history()
#5 /public_html/k9rawfood/catalog/controller/startup/router.php(25): Action->execute(Object(Registry))
#6 /storage1/modification/system/engine/action.php(79): ControllerStartupRouter->index()
#7 /public_html/k9rawfood/system/engine/router.php(67): A in /home2/kplanet1/storage1/modification/system/engine/loader.php on line 89

The website is www.k9rawfood.co.uk

I am also currently have an extension being worked on that appears to be having problems with the storage1 directory. ??

You have migrated your store from a prior version of Opencart which do not contain the new folder locations of the extension model files. In order to resolve this issue, please follow these instructions: viewtopic.php?f=183&t=165958