After installing Abacus on a new machine and attempting to run Messageslips this error appears.
The reason this error appears is while AbacusLaw will work with a UNC mapping, however MessageSlips will not and requires a mapped drive letter. To fix this error you will need to change the properties of the MessageSlips icon so that both the Target and the Start in show a mapped drive letter. Once the icons have been changed to a mapped drive letter you should now be able to open MessageSlips without any errors.
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