ArgumentError at GET /explorer/chain assign @uco_balance not available in eex template

[imnik11]

Description
Running iex -S mix
Open browser http://localhost:4000/explorer/chain . or just click chain in navbar

Expected Behaviour

Actual Behaviour

[imnik11]

`2021-11-08 07:40:31.547 [error] #PID<0.11190.1> running ArchEthicWeb.Endpoint (connection #PID<0.2075.0>, stream id 32) terminated
Server: localhost:4000 (http)
Request: GET /explorer/chain
** (exit) an exception was raised:
** (ArgumentError) assign @uco_balance not available in eex template.

Please make sure all proper assigns have been set. If this
is a child template, ensure assigns are given explicitly by
the parent template as they are not automatically forwarded.

Available assigns: [:address, :chain_size, :conn, :last_checked?, :transaction_chain, :view_module, :view_template]

    (phoenix_html 2.14.3) lib/phoenix_html/engine.ex:139: Phoenix.HTML.Engine.fetch_assign!/2
    (archethic 0.12.4) lib/archethic_web/templates/explorer/chain.html.eex:84: ArchEthicWeb.ExplorerView."chain.html"/1
    (phoenix 1.5.7) lib/phoenix/view.ex:310: Phoenix.View.render_within/3
    (phoenix 1.5.7) lib/phoenix/controller.ex:788: Phoenix.Controller.render_with_layouts/4
    (phoenix 1.5.7) lib/phoenix/controller.ex:776: Phoenix.Controller.render_and_send/4
    (archethic 0.12.4) lib/archethic_web/controllers/explorer_controller.ex:1: ArchEthicWeb.ExplorerController.action/2
    (archethic 0.12.4) lib/archethic_web/controllers/explorer_controller.ex:1: ArchEthicWeb.ExplorerController.phoenix_controller_pipeline/2
    (phoenix 1.5.7) lib/phoenix/router.ex:352: Phoenix.Router.__call__/2
    (archethic 0.12.4) lib/archethic_web/endpoint.ex:1: ArchEthicWeb.Endpoint.plug_builder_call/2
    (archethic 0.12.4) lib/plug/debugger.ex:136: ArchEthicWeb.Endpoint."call (overridable 3)"/2
    (archethic 0.12.4) lib/archethic_web/endpoint.ex:1: ArchEthicWeb.Endpoint.call/2
    (phoenix 1.5.7) lib/phoenix/endpoint/cowboy2_handler.ex:65: Phoenix.Endpoint.Cowboy2Handler.init/4
    (cowboy 2.9.0) /home/nik/imnik11/archethic-node/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
    (cowboy 2.9.0) /home/nik/imnik11/archethic-node/deps/cowboy/src/cowboy_stream_h.erl:306: :cowboy_stream_h.execute/3
    (cowboy 2.9.0) /home/nik/imnik11/archethic-node/deps/cowboy/src/cowboy_stream_h.erl:295: :cowboy_stream_h.request_process/3
    (stdlib 3.15.2) proc_lib.erl:226: :proc_lib.init_p_do_apply/3

`