As you can see from here, there is no cc-pvtz-jkfit defined for lithium.
If you’re really still running psi4 beta5, I advise updating to 1.1 right away. Modern psi knows to select a fitting basis of last resort (DEF2-QZVPP-JKFIT) when the sensible (cc-pvtz-jkfit) isn’t available. If you want to stick with beta5, add
set df_basis_scf DEF2-QZVPP-JKFIT to input. If the file itself isn’t there, download it from EMSL and place it in the basis directory with all the others.