سلام من این دستور را مطابق ویدیو وارد کردم ولی خطا میده چرا؟

دستور:

keytool -genkey -v -keystore $env:USERPROFILE\upload-keystore.jks ` -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 ` -alias upload

خطا:

keytool : The term 'keytool' 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 line:1 char:1
+ keytool -genkey -v -keystore $env:USERPROFILE\upload-keystore.jks `
+ ~~~~~~~
   + CategoryInfo          : ObjectNotFound: (keytool:String) [], CommandNotFoundException
   + FullyQualifiedErrorId : CommandNotFoundException