Asdoc shows error “t is not regulary spaced” and does not return table

Dear all, I am running a regression with a panel data structure (different countries and their changes in bond yields). However, I need to run time-series regressions for each country. At the moment I am running the following regression: bysort CountryCode: asdoc newey chgn10y2d chgnCESI chng10y_L1 AnnQE AnnTa, lag(12) force which returns the following `time is not regularly spaced'. Although I can click on myfile at the end, the link directs me to a webpage (http://myfile.doc/) in my browser. Does anyone have suggestions on how to solve this problem? Any hints are appreciated! Best Nicolas