Run time error 76 In Netsys

Total newbie - first time user. 

I have successfully named a project, used the design database package, and manually added 26 room data and successfully used heat loss load calcs to output reports. 

Now I want to use Netsys for heating pipe sizing. 

When I click the Heating link project explorer application dialog box pops up with my confirmed project details.  When I click on the green arrow to launch Netsys Heating pipe sizing I get run time error 76?

Using V8i SS1 SP2

Any help much appreciated.

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