diff --git a/aplus.go b/aplus.go
index e546b6c..a84df8c 100644
--- a/aplus.go
+++ b/aplus.go
@@ -16,6 +16,10 @@ import (
 func submit_code(course_code int, attendance_code string) bool {
 	cur_body := launch_aplus(course_code)
 	if cur_body == "" {
+		fmt.Println("Unknown error")
+		return false
+	} else if cur_body == "Roles not supported" {
+		fmt.Println("Cannot access course", course_code, "(canvas error \"Roles not supported\")")
 		return false
 	}
 
@@ -101,7 +105,12 @@ func launch_aplus(course_code int) string {
 
 	resp, _ = client.PostForm(base_aplus_link, form_values)
 	body, _ = io.ReadAll(resp.Body)
-	return string(body)
+
+	if strings.Index(string(body), "Roles not supported") != -1 {
+		return "Roles not supported"
+	} else {
+		return string(body)
+	}
 }
 
 func get_aplus(token string, link string, client http.Client) string {
@@ -183,6 +192,10 @@ func submit_code_sans_course(attendance_code string) {
 func timetable(course_code int) {
 	cur_body := launch_aplus(course_code)
 	if cur_body == "" {
+		fmt.Println("Unknown error")
+		return
+	} else if cur_body == "Roles not supported" {
+		fmt.Println("Cannot access course", course_code, "(canvas error \"Roles not supported\")")
 		return
 	}