Is this WPA2 Password uncrackable?

[epixoip]

Sorry I didn't realize the length of your mask was 12 bytes long. Hashcat stores keyspace as a uint64 and 62^12 is greater than 2^64-1, hence it is causing an integer overflow, and that's why Hashcat thinks the keyspace is too small. An integer overflow check was added a few months back, so you must be using an old version.