Deleting A File From File System - Syntax Error

Ok so I have some dynamic sql to delete a file that is created via sql earlier on. It is to provision a copy of a database to an instance on link server. Everything works great and the files used to delete. Now, with no code changes it is throwing a syntax error. I do a print of what the dynamic sql is creating before executing and then I copy / paste what was generated into command prompt and guess what!! The file deletes.

Here is the result on screen:

@DeleteBackupFileStatement: DEL adas16.clients.advance.localwip$AvionteAP_Template_893.bak /Q
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ''.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ''.

Here is the code that creates the statement:

SET @DeleteBackupFileStatement = NULL
BEGIN
SET @DeleteBackupFileStatement = 'DEL ' + LTRIM(RTRIM(@BackupFile)) + ' /Q'
END
PRINT '@DeleteBackupFileStatement: ' + cast(@DeleteBackupFileStatement as varchar(400))
BEGIN
EXEC adasdb.master.sys.Sp_executesql
@DeleteBackupFileStatement
END
END

The value of @BackupFile is simply the path of the file with the file name, everything in the prepared statement with the exception of DEL and the switch at the end.