I have a problem with a Mail Merge from Spreadshee to a Document using openSUSE Linux 42.1

I wish to insert the field “Company Name” from a spreadsheet. I have gone through the options in Mail Merge selecting the current document, the address book source (spreadsheet), I match the fields, then when I try to start I get an error SfxBaseModel::impl_store <file:///tmp/lu1673s0571c.tmp/0.sxw> failed: 0x81a.

Could somebody explain what am I doing wrong and what that error means?

Thanks
Stuart