I am getting a number of the following error messages repeatedly daily. I think they are related to the server backup process but I am not 100% sure. Can someone give me some insight about these, please? We are currently using BackupExec 12.5

0x000012d3 22:19:11 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DB9FFBA.IDX. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DB9FFC6.IDX. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DB9FFD2.IDX. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DBF45C0.IDX. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DBF45CC.IDX. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DBFEE70.INC. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed
0x000012d3 22:19:12 ERR: OpenDataSetForBackup Cannot open file 9[DMS]lib0007:LIB
0004/INDEX/4DC026AA.INC. Error 0xFFFDFFF5 Data set is currently in use and canno
t be accessed