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我与edx developer栈工作，当我试图插入一个条目StudentModule我得到这个错误：EDX学生模块完整性错误
Traceback (most recent call last):
File "<console>", line 2, in <module>
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/manager.py", line 137, in create
return self.get_query_set().create(**kwargs)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/query.py", line 377, in create
obj.save(force_insert=True, using=self.db)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/base.py", line 463, in save
self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/base.py", line 551, in save_base
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/manager.py", line 203, in _insert
return insert_query(self.model, objs, fields, **kwargs)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/query.py", line 1593, in insert_query
return query.get_compiler(using=using).execute_sql(return_id)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 912, in execute_sql
cursor.execute(sql, params)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/backends/util.py", line 40, in execute
return self.cursor.execute(sql, params)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 114, in execute
return self.cursor.execute(query, args)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/MySQLdb/cursors.py", line 201, in execute
self.errorhandler(self, exc, value)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '5-i4x://Organization/EDDC/course/2015-
Organization/EDDC/2015'
for key 'courseware_studentmodule_student_id_635d77aea1256de5_uniq'")