Error Notify availability in the admin panel

Error Notify availability in the admin panel

I can not open the addon "Notify availability" through the admin panel. When you click on "requests availability" get the error:"Fatal error: Class JshoppingControllerRequests_availability cannot extend from interface JController in .../administrator/components/com_jshopping/controllers/requests_availability.php on line 13"

How to resolve this problem?
Thank you.

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Aw: Error Notify availability in the admin panel

Change
JController
to
JControllerLegacy

or

Install Notify availability 1.1.4

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Aw: Error Notify availability in the admin panel

Error installing version 1.1.4: "1060 Duplicate column name 'language' SQL = ALTER TABLE` j3sfr_jshopping_inform_availability_product `ADD` language `VARCHAR (10);"

Aw: Error Notify availability in the admin panel

After installing version 1.1.4 error: "Fatal error: Class JshoppingModelRequests_availability cannot extend from interface JModel in .../administrator/components/com_jshopping/models/requests_availability.php on line 13"

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Aw: Error Notify availability in the admin panel

Install 1.1.5

Aw: Error Notify availability in the admin panel

Again error addon!
After installing version 1.1.5 error: "Fatal error: Class JshoppingViewRequests_availability cannot extend from interface JView in .../administrator/components/com_jshopping/views/requests_availability/view.html.php on line 6"

I'm sorry ...

Aw: Error Notify availability in the admin panel

Notify availability 1.1.5.1

Aw: Error Notify availability in the admin panel

Excellent! Now everything works as it should. Thank you very much.