Kontact "unable to create calendar"

[huw]

I've just installed SolydXK, KDE version, which is based on Debian unstable.  
I'm using Kontact 1.13.7 and KDE 4.12.1.  I backed up my previous calendar, 
and now I can't import it.  If I try and import it as a new calendar I get 
"unable to create calendar ~/icalout.ics".

If I try to merge it with an existing calendar (which as yet has nothing in 
it) I get a different error popup which keeps popping up every time I click 
OK, and I can do nothing but kill the whole process.

How do I import my calendar?

(I can retrieve the error message later if necessary - if I tried to do it now 
I wouldn't be able to send this email)

Many thanks in advance.

Huw
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