diff --git a/internal/cli/root.go b/internal/cli/root.go
index 6bdca6f..3ed9c8c 100644
--- a/internal/cli/root.go
+++ b/internal/cli/root.go
@@ -7,7 +7,6 @@ import (
 	"code.lila.network/adoralaura/certwarden-deploy/internal/certificates"
 	"code.lila.network/adoralaura/certwarden-deploy/internal/configuration"
 	"code.lila.network/adoralaura/certwarden-deploy/internal/constants"
-	"code.lila.network/adoralaura/certwarden-deploy/internal/errlog"
 	"code.lila.network/adoralaura/certwarden-deploy/internal/logger"
 	"github.com/spf13/cobra"
 )
@@ -32,12 +31,14 @@ func handleRootCmd(cmd *cobra.Command, args []string) {
 		os.Exit(1)
 	}
 	log := logger.InitializeLogger()
-	err = errlog.SetupSentry(log, config.Sentry.DSN)
-	if err != nil {
-		slog.Error("failed to initialize sentry", "error", err)
-	}
+	config.SubstituteKeys(log)
 
-	configuration.ValidateConfig(log, *config)
+	validation := config.IsValid()
+	if validation.HasMessages() {
+		validation.Print(log)
+		slog.Error("The configuration file has errors! Application cannot start unless all errors are corrected!")
+		panic(1)
+	}
 
 	certificates.HandleCertificates(log, config)
 }
diff --git a/internal/errlog/sentry.go b/internal/errlog/sentry.go
deleted file mode 100644
index d380d3b..0000000
--- a/internal/errlog/sentry.go
+++ /dev/null
@@ -1,27 +0,0 @@
-package errlog
-
-import (
-	"log/slog"
-
-	"github.com/getsentry/sentry-go"
-)
-
-func SetupSentry(logger *slog.Logger, dsn string) error {
-	if dsn == "" {
-		return nil
-	}
-
-	err := sentry.Init(sentry.ClientOptions{
-		Dsn: dsn,
-		// Set TracesSampleRate to 1.0 to capture 100%
-		// of transactions for performance monitoring.
-		// We recommend adjusting this value in production,
-		TracesSampleRate: 1.0,
-	})
-	if err != nil {
-		logger.Error("failed to set up sentry")
-	}
-	// Flush buffered events before the program terminates.
-
-	return nil
-}