Is this WPA2 Password uncrackable?

[hashbandit]

It's not an error, it's purely informational.

You can also shorten your command line up quite a bit by using -1 ?d?l?u instead of manually listing out all of the characters in the character set.

So is it uncrackable then? I do not understand what it is telling me .
 Too many characters in length or too many characters to choose from?

Can you explain this also "?d?l?u"
?d=0-9 ?u=A-Z ?l=a-z :: 
But how do i use this in the command? How do i specify the length of the password?

Can you shorten the command I wrote as an example please.

thank you for the fast reply