diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index ced7fa2..ae178a3 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -491,7 +491,8 @@ function M.treesitter_and_diag_panel()
   })
   p:add_section({
     header = 'diagnostic',
-    render = function(bufnr)
+    render = function(buf)
+      log(buf, diagnostic)
       if diagnostic_list[ft] ~= nil then
         local display_items = {}
         for _, client_items in pairs(results) do
diff --git a/lua/navigator/formatting.lua b/lua/navigator/formatting.lua
index 4da3393..d860120 100644
--- a/lua/navigator/formatting.lua
+++ b/lua/navigator/formatting.lua
@@ -32,6 +32,9 @@ return {
     end, 100)
   end,
   range_foramt = function(err, result, ctx, _)
+    if err then
+      print("failed to format", vim.inspect(result), vim.inspect(ctx))
+    end
     local old_func = vim.go.operatorfunc
     _G.op_func_formatting = function()
       local start = vim.api.nvim_buf_get_mark(0, '[')
diff --git a/lua/navigator/gui.lua b/lua/navigator/gui.lua
index cf04994..519ea85 100644
--- a/lua/navigator/gui.lua
+++ b/lua/navigator/gui.lua
@@ -1,6 +1,6 @@
 local M = {}
-local ListView = require('guihua.listview')
-local TextView = require('guihua.textview')
+-- local ListView = require('guihua.listview')
+-- local TextView = require('guihua.textview')
 local util = require('navigator.util')
 local log = util.log
 local trace = require('navigator.util').trace
@@ -16,7 +16,7 @@ function M.new_list_view(opts)
     local winnr = active_list_view.win
     local bufnr = active_list_view.buf
 
-    if bufnr and vim.api.nvim_buf_is_valid(bufnr) and winnr and vim.api.nvim_win_is_valid(winnr) then
+    if bufnr and api.nvim_buf_is_valid(bufnr) and winnr and api.nvim_win_is_valid(winnr) then
       log('list view already present')
       return active_list_view
     end
diff --git a/lua/navigator/hierarchy.lua b/lua/navigator/hierarchy.lua
index da55047..51c9902 100644
--- a/lua/navigator/hierarchy.lua
+++ b/lua/navigator/hierarchy.lua
@@ -100,7 +100,7 @@ hierarchy_handler = function(dir, handler, show, api, err, result, ctx, cfg)
   trace(dir, handler, api, show, err, result, ctx, cfg)
   ctx = ctx or {} -- can be nil if it is async call
   cfg = cfg or {}
-  opts = ctx.opts or {}
+  local opts = ctx.opts or {}
   vim.validate({ handler = { handler, 'function' }, show = { show, 'function' }, api = { api, 'string' } })
   local bufnr = ctx.bufnr or vim.api.nvim_get_current_buf()
   assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp hierarchy')
@@ -142,11 +142,12 @@ local function display_panel(args)
 
   local Panel = require('guihua.panel')
   local bufnr = args.bufnr or vim.api.nvim_get_current_buf()
-  local ft = args.ft or vim.api.nvim_buf_get_option(bufnr, 'buftype')
+  -- local ft = args.ft or vim.api.nvim_buf_get_option(bufnr, 'buftype')
   local items = args.items
   local p = Panel:new({
     header = args.header or 'Call Hierarchy',
-    render = function(bufnr)
+    render = function(buf)
+      log(buf)
       return items
     end,
     fold = function(panel, node)
diff --git a/lua/navigator/lazyloader.lua b/lua/navigator/lazyloader.lua
index 5c5e090..45521b5 100644
--- a/lua/navigator/lazyloader.lua
+++ b/lua/navigator/lazyloader.lua
@@ -1,7 +1,6 @@
 return {
   init = function()
     local loader = nil
-    packer_plugins = packer_plugins or nil -- suppress warnings
     local log = require('navigator.util').log
     -- packer only
     if packer_plugins ~= nil then -- packer install
diff --git a/lua/navigator/lspclient/config.lua b/lua/navigator/lspclient/config.lua
index c930aba..71590d1 100644
--- a/lua/navigator/lspclient/config.lua
+++ b/lua/navigator/lspclient/config.lua
@@ -1,5 +1,3 @@
-local lsp = require("vim.lsp")
-
 local M = {}
 local capabilities = vim.lsp.protocol.make_client_capabilities()
 capabilities.textDocument.completion.completionItem.snippetSupport = true
diff --git a/lua/navigator/util.lua b/lua/navigator/util.lua
index dd76a16..876d36d 100644
--- a/lua/navigator/util.lua
+++ b/lua/navigator/util.lua
@@ -61,7 +61,7 @@ function M.get_data_from_file(filename, startLine)
   return { data = data, line = displayLine }
 end
 
-function M.io_read(filename, total)
+function M.io_read(filename)
   local f = io.open(filename, 'r')
   if f == nil then
     return nil