I bought a new phone this morning and tried to transfer all my chats and contacts on line app. in the new phone. But this happen (as in the photo). Someone know how to solve this? Thank you

Is the LINE app still working on your old phone?  If so, go into account and get the phone number and password and LINE ID.

 

Then uninstall the LINE app in the new phone.  After the uninstall, restart the phone.

 

Install the LINE app again on the new phone.

 

Try registering your LINE account on the new phone scanning Q-Codes from old phone to new.  If this doesn't work, manually enter your account details.

 

Once successful, you will not be able to use LINE on your old phone.  A notification will tell you this.