Boot Camp problem

I have macbook pro mid12 with Mojave operating system on it. I have a space of 500 GB, around 120 GB was partitioned by bootcamp to install windows 10, now I was trying to uninstall windows 10 using bootcamp again, but i received the below message that "your disk couldn't be restored to a single partition". Then when I opened the Disk Utility, I found that it reads only one partition, the 380 GB for Macintosh, and the 120 GB disappeared. I used terminal to make if the space is there using "diskutil list" and I found that it only reads the 380 GB space and nothing appears about the 120 GB space as you can see below. Can anyone assist me to solve this problem?... Thanks in advance!