a6bb6589_seUS_Todo_Backup__online_help___Meaning
[Error Codes] 0X*****067 [Error Codes_2] 0X*****334 [Meaning_3] You cannot use read-only partition as the destination, if you want to continue, please cancel its read-only property. [Meaning] 
No source volume is selected
Error Code list of EaseUS Todo Backup- online help.
Meaning