adding permission error

test.py

@@ -6,6 +6,7 @@ import threading
 from os import walk, path, makedirs, remove, rename, listdir
 
 import discord
+import dislash
 from discord.ext import commands
 from dislash import InteractionClient, Option, OptionType, OptionChoice
 
@@ -131,7 +132,7 @@ class Commands:
     @staticmethod
     async def set_prefix(ctx, prefix: str):
         await Commands.write_json(ctx.guild.id, "prefix", prefix)
-        await ctx.send(f"Prefix set to: `{prefix}`")
+        await ctx.send(f"Prefix set to: `{prefix}`", ephemeral=True)
 
     @staticmethod
     def list_files(fold: str):
@@ -150,12 +151,12 @@ class Commands:
         parameter = None
         try:
             with open('prefix.json', 'r', encoding='utf-8') as fp:  # Open the JSON
-                jsonObject = json.load(fp)  # Load the custom prefixes
+                _json = json.load(fp)  # Load the custom prefixes
         except TypeError:
-            jsonObject = {}
+            _json = {}
         if guild:  # If the guild exists
             try:
-                guild_conf = jsonObject[f"{guild}"]
+                guild_conf = _json[f"{guild}"]
                 try:
                     parameter = guild_conf[f"{param}"]
                 except TypeError:
@@ -306,11 +307,17 @@ async def command_set_prefix(ctx, prefix: str):
         Option("prefix", "Specify prefix", OptionType.STRING, required=True),
     ]
 )
-@commands.has_permissions(administrator=True)
+@dislash.has_permissions(administrator=True)
 async def slash_set_prefix(ctx, prefix: str):
     await Commands.set_prefix(ctx, prefix)
 
 
+@slash_set_prefix.error
+@command_set_prefix.error
+async def set_prefix_error(ctx):
+    await ctx.reply('You don`t have permissions')
+
+
 @inter_client.slash_command(
     name="info",
     description="Read list of tracks for user",
@@ -346,7 +353,7 @@ async def info(ctx, user=None):
     emb.add_field(name="Roles list", value=f"{roles}", inline=True)
     emb.set_footer(text="Information requested by: {}".format(ctx.author.display_name))
 
-    await ctx.reply(embed=emb)
+    await ctx.reply(embed=emb, ephemeral=True)
 
 
 @inter_client.slash_command(
@@ -376,7 +383,7 @@ async def set_bot_role(ctx, role):
 
 
 @inter_client.slash_command(
-    name="cogs",
+    name="cog",
     description="Work with cogs",
     options=[
         Option("what do",