my problem is, after a try to clone with "vmkfstools" the error " CLVMKFS1 error: Failed to clone disk: The file specified is not a virtual disk (15)."
in the .vmx file, I set ctkEnabled = "false" and scsi0:0.ctkEnabled = "false" .. 3 times power off and on, description from a tutorial.
its a ESXi 6 - HPE Customized Image ESXi 6.0.0 Update 3 version 600.10.3.5 released on September 2018 and based on ESXi 6.0.0 Update 3 Vmkernel Release Build 9313334.
what can I do?
We don't support manufacturer builds. They are plainly not ESXi, as they are heavily customized and they frequently contain bugs.
That does not mean that (c)XSIBackup will not work with manufacturer builds but that we can guarantee nothing, as manufacturers frequently do not respect basic principle designs of ESXi.
Your problem seems related to your .vmdk files having been edited by some non UTF-8 text editor or containing bad pointers to -flat.vmdk files.