Fixed error message if a pack cannot be found in current index.pidx

cmd/errors/errors.go

@@ -87,7 +87,7 @@ var (
 	ErrPackVersionNotFoundInPdsc       = errors.New("pack version not found in the pdsc file")
 	ErrPackVersionNotLatestReleasePdsc = errors.New("pack version is not the latest in the pdsc file")
 	ErrPackVersionNotAvailable         = errors.New("target pack version is not available")
-	ErrPackURLCannotBeFound            = errors.New("URL for the pack cannot be determined. Please consider updating the public index. Ex: cpackget index --force https://keil.com/pack/index.pidx")
+	ErrPackURLCannotBeFound            = errors.New("URL for the pack cannot be determined. Please consider updating the public index. Ex: cpackget update-index")
 
 	// Hack to allow multiple error logs while still avoiding duplicating the last error log
 	ErrAlreadyLogged = errors.New("already logged")