extracting root folder to a user home folder command
 

I mounted a folder inside my C drive to a root path of mnt/myFolder

now I am trying to copy the contents of that folder to /home/dev/build/mysource

I used that command that was taught by my senior inside the folder that I want to copy but it is not working as the error I am getting is

can you please help me understand why this is happening ?

this is my command:

Thank you

Sorry but I don't understand what a "C drive" is. What distro are you using?
jdk

That is not a valid Linux command. If you just want to copy a directory, then use cp -r, eg:

Change the ':' to a '|'. You want to create a pipe from the first tar to the second.

Also, the * will miss any hidden files, but . will copy everything.