GEOPAK-GPK ACCESS

Hello,

I am using Geopak v8i SS2.

I have been working in my project without error.  However, on attempting to open my prject this morning for the first time, I get an error message: "Unable to Open Job (M:\C\CGT HDD SUPPORT\DGN\\jobJOB.gpk)"  How can I fix this or diagnose the problem with the gpk file?