Issue with exec-tests while running mvn test from eclipse

Hello Everyone,

I had this issue with Maven , it worked all well yesterday, but today I got
this message error

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:exec
(exec-tests) on project rest-testing: Command execution failed. Cannot run
program "mvn" (in directory
"C:\Users\Bill\Perforce\MyWorkSpace\depot\Project\main\Server\rest-testing"):
CreateProcess error=2, Le fichier spécifié est introuvable -> [Help 1]

Could anyone help me figure out from where the issue comme from ? and how to
fix it ?

Thanks in advance