My App Android is LOCK

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1

Hi, one week ago when I finished English 4 offline I started The Lesson 5, but this came with mistakes, I’ve tried but it doesn’t work. The lessons in the course have a LOCK, and when I want to start one of them, the lesson blows and sends me to the main menu. Please Help me.

Pdt: Sorry for my English

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2

Do you have a paid subscription? If not this is just something that can happen - not all courses are (completely) available for free.