GUID Problem

[promxxiii]

Hello, I was trying to install macOS High Sierra but the installer is saying "The disk doesn't use the GUID Partition Table scheme".
Is there any way to convert that partition to GUID without losing my data from my other partitions or I have to format the entire drive and lose my partitions and all of my data?
Thank you

 

[jianhaoz]

You have to backup your data and erase the disk and partition again.