Microsoft Project 2010 Error - There was a problem linking these tasks

Hi all,

I get the following error in Microsoft Project 2010:

Error message
To replicate the error:
I copy a summary task and its contents into another summary task in the same project schedule
When I try to change any dependencies where I pasted the tasks, I get the error

I've spent the entire weekend so far and I cannot understand this.  
I'm pretty sure that I'm not creating circular references at all.
Please assist.

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Well you might be convinced you are not creating a circular  link, but you are. Simple as that.

It may be several tasks away from where you are looking, but it will be there somewhere.
ApplePietAuthor Commented:
Thanks Paul,

Is there any way that MS Project can tell me which tasks are the problem?

If it's able to detect a circular link, surely it must know which tasks are linked...

Thanks again
>>"I copy a summary task and its contents into another summary task in the same project schedule"

make a copy of your project file to "play with" (i.e. have a backup)

Almost all circular links are caused by placing dependencies onto summary tasks. Keep this in mind.

Resolving theses circular links can be painful and tedious.
Have both the Successor and Predecessor columns visible in the view

Then read these (both are short):

so, basically
a.  you retain the predecessor data into a text column
b.  then clear the predecessors*
c.  then try to re-create the predecessors, when doing this the culprit links should be identified

*I would focus on links into or out of summary tasks, you could try just clearing these instead of clearing all

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Usually you get a message if you try to insert a circular relation.
So, if you typed something, it has to be the task you last edited.

If you insert the successor column beside the predecessor column, you should see, which task are related.,

By the way, linking on summary task is not best practice...
Best practice is, that every work item (and only the work items) has a predecessor and a successor (with the exception of the first one and the last one.
<<"By the way, linking on summary task is not best practice..."
yep: complete and absolute agreement
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