I am using ProScheduler Teamboard, however, I have one project that I cannot plan tasks.

[Jason Chayer]

I use ProScheduler to plan out all my tasks. If you go through ProScheduler in the project, you can utilize their Gantt chart. However, I cannot plan tasks for one project. Any other project I can. Any suggestions?

[Norman Abramovitz]

The most common way is to restore a project from backup with all its painful process.

https://confluence.atlassian.com/display/JIRAKB/How+to+Merge+JIRA+Instances

https://answers.atlassian.com/questions/41684

I have also done a the very painful process of updating the xml export to get things to import correctly.  Multiple trial and error tests to get things working correctly.  

The other approach is a custom script using APIs to extract and import issues which might be easier.  I believe you will need some of the older api's (RPC) verses using REST all the way through.  So you will have a conversion issue to deal with as well.

[Nic Brough -Adaptavist-]

To expand on that process briefly, it is - Export everything from 4.4 - Import it into a, empty temporary dev copy of 6.0, which upgrades it - Export from 6.0 - Set up all the fields, screens, workflows and so-on that you need to support the project in 6.0 Use "project import" to pull in just that one project from the 6.0 export As Norman says, painful...