Invalid username error on importing project from Fogbugz on Demand

[Gottfried Theimer]

I am evaluating Jira as potential migration target coming from FogBugz. Unfortunately, importing a project from FogBugz on Demand, following the instructions given by Atlassian, fails and produces the following log:

2018-12-19 10:16:17,520 INFO - Import started by gtheimer using com.atlassian.jira.plugins.importer.imports.fogbugz.hosted.FogBugzHostedDataBean
2018-12-19 10:16:17,537 INFO - ------------------------------
2018-12-19 10:16:17,537 INFO - Importing: Users
2018-12-19 10:16:17,545 INFO - ------------------------------
2018-12-19 10:16:17,545 INFO - Only new items will be imported
2018-12-19 10:16:17,845 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,854 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,859 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,866 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,889 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,890 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,897 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,903 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,904 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,918 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,922 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,947 WARN - Invalid username '' - You must specify a username.
2018-12-19 10:16:17,948 ERROR - Cannot perform import due to 12 invalid usernames
com.atlassian.jira.plugins.importer.external.InvalidUsernamesException: Cannot perform import due to 12 invalid usernames
	at com.atlassian.jira.plugins.importer.external.ExternalUserUtils.checkInvalidUsernames(ExternalUserUtils.java:134)
	at com.atlassian.jira.plugins.importer.external.ExternalUserUtils.prepareUsers(ExternalUserUtils.java:107)
	at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.importUsers(DefaultJiraDataImporter.java:564)
	at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:345)
	at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:26)
	at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:15)
	at com.atlassian.jira.task.TaskManagerImpl$TaskCallableDecorator.call(TaskManagerImpl.java:458)
	at com.atlassian.jira.task.TaskManagerImpl$TaskCallableDecorator.call(TaskManagerImpl.java:426)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at com.atlassian.jira.task.ForkedThreadExecutor$ForkedRunnableDecorator.run(ForkedThreadExecutor.java:216)
	at java.lang.Thread.run(Thread.java:748)
2018-12-19 10:16:18,321 INFO - No issues need to be reindex
 

Any hint how to solve this problem would be awesome.

[Nicholas Carter]

Had the same issue. Potentially users in Fogbugz with no email address or users with duplicate emails.

Had to get these users from the API.

[Ekta Soni]

Even I too facing same problem . If someone has resolved this issue please help .

[Vitaliy Minakov]

I'm having the same problem- any resolution?