Errors when starting a PowerShell session

I was using PowerShell normally (was using posh git, just to mention), and suddenly a weird behavior happened, I tried to restart the session, when I did, I got many errors, which are :

Split-Path : The term 'Split-Path' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path
was included, verify that the path is correct and try again.
At C:\Users\aymen.daoudi\Documents\WindowsPowerShell\Modules\posh-git\profile.example.ps1:1 char:16
+ Push-Location (Split-Path -Path $MyInvocation.MyCommand.Definition -P ...
+                ~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Split-Path:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Import-Module : The specified module '.\posh-git' was not loaded because no valid module file was found in any module directory.
At C:\Users\aymen.daoudi\Documents\WindowsPowerShell\Modules\posh-git\profile.example.ps1:4 char:1
+ Import-Module .\posh-git
+ ~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (.\posh-git:String) [Import-Module], FileNotFoundException
    + FullyQualifiedErrorId : Modules_ModuleNotFound,Microsoft.PowerShell.Commands.ImportModuleCommand

Enable-GitColors : The term 'Enable-GitColors' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or
if a path was included, verify that the path is correct and try again.
At C:\Users\aymen.daoudi\Documents\WindowsPowerShell\Modules\posh-git\profile.example.ps1:26 char:1
+ Enable-GitColors
+ ~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Enable-GitColors:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Pop-Location : The term 'Pop-Location' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a
path was included, verify that the path is correct and try again.
At C:\Users\aymen.daoudi\Documents\WindowsPowerShell\Modules\posh-git\profile.example.ps1:28 char:1
+ Pop-Location
+ ~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Pop-Location:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Start-SshAgent : The term 'Start-SshAgent' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if
a path was included, verify that the path is correct and try again.
At C:\Users\aymen.daoudi\Documents\WindowsPowerShell\Modules\posh-git\profile.example.ps1:30 char:1
+ Start-SshAgent -Quiet
+ ~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Start-SshAgent:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Here's a picture of that :

I tried to restart the PC, but still have the same problem every time I start a new PowerShell session, I noticed that many commands don't work, what caused this problem ? and what should I do to solve it ?

Update

I removed the profiles added by PoshGit, when starting a new session, I don't have any error, but powershell still doesn't recognize commands, for example calling Clear-host, throws lots of errors that I can't understand the cause !