While you do have a Volume on your internal HDD called BOOTCAMP this is not a native install of Windows and is instead just a space on the overall HDD that you have save a normal file based Virtual Machine to and it only has 1.52 GB available and this is not adequate free host disk space and why you're getting the warning message. Also this Virtual Machine has 5 Snapshots and even though the virtual hard disk is of type "twoGbMaxExtentSparse" you do not have adequate free disk space on the BOOTCAMP Volume to delete all the Snapshots. So you'd need to copy the Virtual Machine Package to the Macintosh HD to delete the Snapshots.
BTW It shows that the BOOTCAMP Volume has a MS-DOS FAT32 File System so if you had actually installed Windows natively it was not done properly as it should have been reformatted NTFS during the install. What it looks like is maybe you were going to install Windows natively and you changed your mind and save a normal file based Virtual Machine to that Volume instead of the default location which is "~/Documents/Virtual Machines.localized", noting the .localized extension is hidden by default. However only you know what you've done and can explain it! 