Fixed the error, whenever oppening the assignments tab and error screen occurs

widget_group_18/assignments/migrations/0005_assignment_course.py

+# Generated by Django 3.2.12 on 2022-04-05 01:53
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assignments', '0004_course'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='assignment',
+            name='course',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='assignments.course'),
+        ),
+    ]

widget_group_18/assignments/models.py

@@ -7,13 +7,7 @@ class Course(models.Model):
     section = models.CharField(max_length=3)
 
 class Assignment(models.Model):
-    course = models.ForeignKey(Course, on_delete=models.CASCADE)
+    course = models.ForeignKey(Course, on_delete=models.CASCADE, null=True)
     name = models.CharField(max_length=50)
     description = models.CharField(max_length=500)
     max_points = models.IntegerField(default=0)
-
-
-
-
-    def __str__(self):
-        return self.name