Package erssical

Failed to find a solution:

no platform:
2024-01-29 15:01.15 [INFO] Solving for ocaml-base-compiler, ocaml,
                           erssical using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 15:01.21 [INFO] base: eliminated all possibilities in 2.86 s

2024-01-29 15:01.21 [INFO] = base =

2024-01-29 15:01.21 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base conf-libcurl.2 ocaml-config.3
          ocaml-options-vanilla.1 ocamlbuild.0.14.3 ocamlfind.1.9.6
          ocamlrss.2.2.2 ocurl.0.9.2 topkg.1.0.7 xmlm.1.4.0
          erssical&ocaml&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler ocaml base-domains ocaml-base-compiler
- erssical -> erssical.0.1
    User requested = 0.1
- ocaml -> ocaml.5.1.0
    User requested <= 5.1.0
- ocaml-base-compiler -> ocaml-base-compiler.5.1.0
    User requested >= 4.04.1
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.1.0~ & < 5.1.1~
- ocamlnet -> (problem)
    erssical 0.1 requires >= 3.6.5 & <= 3.7.7
    Rejected candidates:
      ocamlnet.4.1.9-2: Incompatible with restriction: >= 3.6.5 & <= 3.7.7
      ocamlnet.4.1.9-1: Incompatible with restriction: >= 3.6.5 & <= 3.7.7
      ocamlnet.4.1.9: Incompatible with restriction: >= 3.6.5 & <= 3.7.7
      ocamlnet.4.1.8: Incompatible with restriction: >= 3.6.5 & <= 3.7.7
      ocamlnet.4.1.7: Incompatible with restriction: >= 3.6.5 & <= 3.7.7
      ...
- xtmpl -> (problem)
    erssical 0.1 requires > 0.4 & <= 0.6
    Rejected candidates:
      xtmpl.0.19.0: Incompatible with restriction: > 0.4 & <= 0.6
      xtmpl.0.18.0: Incompatible with restriction: > 0.4 & <= 0.6
      xtmpl.0.17.0: Incompatible with restriction: > 0.4 & <= 0.6
      xtmpl.0.16.0: Incompatible with restriction: > 0.4 & <= 0.6
      xtmpl.0.15.0: Incompatible with restriction: > 0.4 & <= 0.6
      ...