${PWD}" includes invalid characters for a local volume name

[BillyBob1980]

Hi Luca,

When trying to run CRISPR-SURF from a local installation, I get the following error message

docker run -v ${PWD}/:/DATA -w /DATA pinellolab/crisprsurf SURF_design

"docker: Error response from daemon: create ${PWD}: "${PWD}" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intended to pass a host directory, use absolute path."

What is the path for the DATA directory on a local installation, or how can I find it? Sorry I am new to Docker.