This typically happens when you install a new version of DeePMD-kit and copy directly the generated USER-DEEPMD to a LAMMPS source code folder and re-install LAMMPS.
To solve this problem, it suffices to first remove USER-DEEPMD from LAMMPS source code by
make no-user-deepmdand then install the new USER-DEEPMD.
If this does not solve your problem, try to decompress the LAMMPS source tarball and install LAMMPS from scratch again, which typically should be very fast.