Not able to create a new student using the command line argument

[dheeraj1991]

java -jar cloudcoderApp-v0.1.0.jar registerstudents
For which course would you like to register students?
0 - CCDemo - CloudCoder demo course
[Enter value in range 0..0] 0
Enter the name of the file containing a tab-separated list student registration entries in this format:
username firstname lastname email password section
Usernames in the datbase will be re-used, but the names/email/password will not be updated,and users will not be registered for a course if they are already registered
[default: ] ==> test
Note that this may be a slow operation
Some logging results will be appended to logs/cloudcoder.log rather than echoed to stdout
java.lang.IllegalArgumentException: Unsupported conversion from java.lang.Integer to java.lang.String
at org.cloudcoder.app.server.persist.util.DBUtil.convertValue(DBUtil.java:820)
at org.cloudcoder.app.server.persist.util.DBUtil.loadModelObjectFields(DBUtil.java:926)
at org.cloudcoder.app.server.persist.util.DBUtil.loadModelObjectFields(DBUtil.java:908)
at org.cloudcoder.app.server.persist.util.ConfigurationUtil.getUsersInCourse(ConfigurationUtil.java:455)
at org.cloudcoder.app.server.persist.util.ConfigurationUtil.registerStudentsForCourseId2(ConfigurationUtil.java:391)
at org.cloudcoder.app.server.persist.RegisterStudents.registerStudents(RegisterStudents.java:49)
at org.cloudcoder.app.server.persist.RegisterStudents.main(RegisterStudents.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.cloudcoder.jetty.NestedJarClassLoader.runMain(NestedJarClassLoader.java:107)
at org.cloudcoder.jetty.WebServer.runAdminCommand(WebServer.java:99)
at org.cloudcoder.jetty.WebServer.handleCommand(WebServer.java:86)
at org.cloudcoder.webserver.CloudCoderWebServer.main(CloudCoderWebServer.java:61)
Database error: Unsupported conversion from java.lang.Integer to java.lang.String

Test File Contents :
test1 test1 test1 dheeraj@gmail.com pass 101