Help with the Error!

As can I see, there were no file H1_1019.9__1020.1_0.1_T08_Run2_0 in projects directory...

There have never been. There should be a file "H1_1019.9", that's probably all you see of this specific result. You should also have "earth" and "sun" files in your project directory, together with some "Config*" file. Hm, this is actually an error from the boinc client which apparently doesn't write which file is missing. Well, the Result should report as error, but the next one shouldn't be affected by that.

BM