diff --git a/main.go b/main.go
index 481349f..ea45958 100644
--- a/main.go
+++ b/main.go
@@ -69,9 +69,9 @@ func main() {
 	// Read system "base" config file if it exists
 	if config.System.Base != "" {
 		var systemConfig Config
-		path := "services/" + config.System.Base + ".json"
+		fp := "services/" + config.System.Base + ".json"
 
-		file, err := os.ReadFile(path)
+		file, err := os.ReadFile(fp)
 		if err != nil {
 			fmt.Println("Cannot read system base config file")
 			fmt.Println(err)
@@ -90,7 +90,6 @@ func main() {
 
 	// Parse user services
 	for name, service := range config.Services {
-		var b strings.Builder
 		s := ServiceConfig{
 			Config: make(map[string]interface{}),
 		}
@@ -99,8 +98,9 @@ func main() {
 		if service.Provider == "" { service.Provider = "system" }
 
 		// Read service config file
-		fmt.Fprintf(&b, "services/%s/%s.json", name, service.Provider)
-		c, err := os.ReadFile(b.String())
+		fp := fmt.Sprintf("services/%s/%s.json",
+			name, service.Provider)
+		c, err := os.ReadFile(fp)
 		if err != nil {
 			switch err := err.(type) {
 			case *os.PathError:
@@ -143,7 +143,11 @@ func main() {
 					fmt.Println("Error: No port defined for proxy to", s.Proxy)
 					return
 				}
-				AddProxy(s.Proxy, ports[0])
+				err = AddProxy(s.Proxy, ports[0])
+				if err != nil {
+					fmt.Println(err.Error())
+					return
+				}
 			}
 		}
 	}
@@ -157,12 +161,11 @@ func main() {
 	// Generate service config templates
 	for name, s := range config.Services {
 		for _, f := range s.ConfigFiles {
-			var b strings.Builder
 			f := strings.Split(f, ":")
 
 			// Read service template file
-			fmt.Fprintf(&b, "services/%s/%s", name, f[0])
-			t, err := os.ReadFile(b.String())
+			fp := fmt.Sprintf("services/%s/%s", name, f[0])
+			t, err := os.ReadFile(fp)
 			if err != nil {
 				fmt.Println("No template for service: ", err)
 				return
diff --git a/scripted.go b/scripted.go
index ec42c10..00ae630 100644
--- a/scripted.go
+++ b/scripted.go
@@ -1,10 +1,36 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 )
 
+// Scripted proxy errors
+var ErrConversion = errors.New("port is not a number")
+var ErrDuplicate  = errors.New("duplicate entry")
+
+type ProxyError struct {
+	Domain	string
+	Port	string
+	Err	error
+}
+
+func (e *ProxyError) Error() string {
+	return fmt.Sprintf("Proxy for %s:%s: %s",
+		e.Domain, e.Port, e.Err.Error())
+}
+
+func (e *ProxyError) Unwrap() error { return e.Err }
+
+func conversionError(domain, port string) *ProxyError {
+	return &ProxyError{domain, port, ErrConversion}
+}
+
+func duplicateError(domain, port string) *ProxyError {
+	return &ProxyError{domain, port, ErrDuplicate}
+}
+
 type Proxy struct {
 	Domain	string
 	Port	int
@@ -19,26 +45,26 @@ func ScriptedInit() {
 func GetProxy() ([]Proxy) {
 	var p []Proxy
 	for port, domain := range proxyList {
-		p = append(p, Proxy{Domain: domain, Port: port})
+		p = append(p, Proxy{domain, port})
 	}
 	return p
 }
 
-func AddProxy(domain string, port string) {
+func AddProxy(domain, port string) (error) {
 	p, err := strconv.Atoi(port)
 	if err != nil {
-		fmt.Println(err)
-		fmt.Printf("Error: proxy for %s, port is not a number: %s\n", domain, port)
-		return
+		return conversionError(domain, port)
 	}
 
 	conflict, exists := proxyList[p]
 	if exists == true {
 		fmt.Println("Error: Conflicting proxy settings:")
-		fmt.Printf(" %s:%s\n", conflict, p)
-		fmt.Printf(" %s:%s\n", domain, p)
-		return
+		fmt.Printf(" %s:%d\n", conflict, p)
+		fmt.Printf(" %s:%d\n", domain, p)
+		return duplicateError(domain, port)
 	}
 
 	proxyList[p] = domain
+
+	return nil
 }