ocaml 4.11.0

Error log

The package failed to build. The error log from opam follows.

[NOTE] Package dune is already installed (current version is 2.7.1).
[NOTE] Package ocamlfind is already installed (current version is 1.9.6).
[ERROR] Package conflict!
  * Incompatible packages:
    - (invariant) -> ocaml-base-compiler = 4.11.2
    - merlin = 3.3.7~4.11preview1 -> ocaml = 4.11.0 -> ocaml-variants < 4.11.1~
    You can temporarily relax the switch invariant with `--update-invariant'
  * Missing dependency:
    - merlin = 3.3.7~4.11preview1 -> ocaml = 4.11.0 -> ocaml-variants < 4.11.1~ -> ocaml-beta
    unmet availability conditions: 'enable-ocaml-beta-repository'

No solution found, exiting