I frequently experiencing a problem when using ADOLisp_ConnecttoDB. I sometimes am unable to connect, and the following message appears at the AutoCAD Command Line : error: Exception occurred: 0xC0000005 (Access Violation), however, if I restart AutoCAD, it will then generally work fine (but not always).
(setq sConn (strcat "Provider=Microsoft.ACE.OLEDB.16.0" ";Data Source=" fn ";;;"))
(setq ccname (ADOLISP_ConnectToDB sconn "" ""))
; error: Exception occurred: 0xC0000005 (Access Violation)
; warning: unwind skipped on unknown exception