# Not a valid license file, license file extension shall be rlf

**URL:** <https://tech-community.robotics.abb.com/t/not-a-valid-license-file-license-file-extension-shall-be-rlf/10617>\
**Category:** UpFeed\
**Created:** [March 7, 2022, 7:59am UTC](https://tech-community.robotics.abb.com/t/not-a-valid-license-file-license-file-extension-shall-be-rlf/10617 "2022-03-07T07:59:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![yd008](https://avatars.discourse-cdn.com/v4/letter/y/9dc877/32.png) [@yd008](https://tech-community.robotics.abb.com/u/yd008)\
**Post date:** [March 7, 2022, 7:59am UTC](https://tech-community.robotics.abb.com/t/not-a-valid-license-file-license-file-extension-shall-be-rlf/10617/1 "2022-03-07T07:59:19Z")

</div>

Recently, I tried to restore the backup of the field robot in Robot Studio, but kept reporting the error “Not a valid license file, license file extension shall be RLF” in Robot sudio. Here is my attempt.

1. I have changed the Robot Studio version. I have tried both 6.08 and 2021.2 versions, but the same mistake still appears

2. The Robot ware version is the same as the field robot version

3, I used the other 3 computers and tried to recover in the virtual machine, but it didn’t work

1. I tried several different field backups that used to be recoverable, and now every one of them is reporting an error

2. The system I created with Robot Studio is backed up on the computer, which can be restored in software