Sir I have these codes for sqlserver backup

flname='at17'
mdest2=[D:\Backup/]
nresult=SQLEXEC(m.con,"backup database &flname to disk='&mdest2\&flname..bak'")
IF nresult<0
	aerror(laerror)
	messagebox(laerror[1,2])
	return(0)
ELSE
	MESSAGEBOX("Done")
ENDI

The codes work fine in Development mode but when I run codes in EXE then it shows this error message

Connectivity error: [Microsoft][ODBC SQL Server Driver][SQL Server]Cannot perform a backup or restore operation within a transaction.

I tested codes on SERVER before any transaction,

What I am doing wrong?