Why can't I move while I'm testing in Roblox Studio?

Hello, I have a very bad problem! Every time when I try to test any game/project in Roblox studio I can't move my avatar or the camera . Here is the error codes which I see in my Output every time when I start a new project or load an existing one :

14:17:34.444 - Baseplate was auto-saved

14:17:34.809 - TopbarConstants is not a valid member of Folder

14:17:34.810 - Stack Begin

14:17:34.811 - Script 'CoreGui.RobloxGui.CoreScripts/Topbar', Line 34

14:17:34.812 - Stack End

14:17:34.933 - GoogleAnalyticsUtils is not a valid member of Folder

14:17:34.934 - Stack Begin

14:17:34.936 - Script 'CoreGui.RobloxGui.CoreScripts/PerformanceStatsManagerScript', Line 15

14:17:34.937 - Stack End

14:17:35.214 - TenFootInterface is not a valid member of Folder

14:17:35.215 - Stack Begin

14:17:35.216 - Script 'CoreGui.RobloxGui.CoreScripts/GamepadMenu', Line 21

14:17:35.218 - Stack End

14:17:35.388 - ChatSelector is not a valid member of Folder

14:17:35.391 - Stack Begin

14:17:35.391 - Script 'Script Context.StarterScript', Line 38

14:17:35.392 - Stack End

14:17:35.397 - PlayerlistModule is not a valid member of Folder

14:17:35.398 - Stack Begin

14:17:35.399 - Script 'Script Context.StarterScript', Line 39

14:17:35.400 - Stack End

14:17:35.401 - BackpackScript is not a valid member of Folder

14:17:35.402 - Stack Begin

14:17:35.403 - Script 'Script Context.StarterScript', Line 50

14:17:35.404 - Stack End

14:17:36.293 - Server is not a valid member of Folder

14:17:36.298 - Stack Begin

14:17:36.299 - Script 'Script Context.ServerStarterScript', Line 90

14:17:36.300 - Stack End

14:17:40.011 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("TenFootInterface")'

14:17:40.012 - Stack Begin

14:17:40.013 - Script 'CoreGui.RobloxGui.CoreScripts/PurchasePromptScript2', Line 50

14:17:40.015 - Stack End

14:17:41.111 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("PromptCreator")' 14:17:41.113 - Stack Begin

14:17:41.113 - Script 'CoreGui.RobloxGui.CoreScripts/FriendPlayerPrompt', Line 20

14:17:41.115 - Stack End

14:17:41.116 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("PromptCreator")' 14:17:41.117 - Stack Begin

14:17:41.118 - Script 'CoreGui.RobloxGui.CoreScripts/BlockPlayerPrompt', Line 20

14:17:41.119 - Stack End

14:17:41.144 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("TenFootInterface")'

14:17:41.145 - Stack Begin

14:17:41.146 - Script 'CoreGui.RobloxGui.CoreScripts/VehicleHud', Line 22

14:17:41.147 - Stack End

14:17:41.149 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("TenFootInterface")' 14:17:41.150 - Stack Begin

14:17:41.151 - Script 'CoreGui.RobloxGui.CoreScripts/NotificationScr ipt2', Line 70

14:17:41.153 - Stack End

14:17:41.311 - Infinite yield possible on 'CoreGui.RobloxGui.Modules:WaitForChild("TenFootInterface")'

14:17:41.312 - Stack Begin

14:17:41.313 - Script 'CoreGui.RobloxGui.CoreScripts/MainBotChatScript2', Line 108

14:17:41.314 - Stack End