4.13.1 install failed

[swuecho]

pin

NOTE] Package ppx_pgsql is already pinned to git+https://github.com/tizoc/ppx_pgsql.git (version 0.4).
Processing: [ppx_pgsql.0.4: git]
[ppx_pgsql.0.4] no changes from git+https://github.com/tizoc/ppx_pgsql.git
[WARNING] Failed checks on ppx_pgsql package definition from source at git+https://github.com/tizoc/ppx_pgsql.git:
    error 57: Synopsis and description must not be both empty
ppx_pgsql is now pinned to git+https://github.com/tizoc/ppx_pgsql.git (version 0.4)

Sorry, no solution found: there seems to be a problem with your request.

[NOTE] Pinning command successful, but your installed packages may be out of sync.

and install failed

Sorry, no solution found: there seems to be a problem with your request.

No solution found, exiting
'opam install -vv ppx_pgsql' failed.