I am trying to develop an interactive report in which I am using blob column to download the blob file (that could be jpeg or pdf). I created the download field on the blob column but, when I clicked on it, it gives an error as mentioned below.  

"**The requested URL /apex/apex\_util.get\_blob was not found on this server**"

Note: I am using oracle apex 5.1.2.

Can anybody please help me to resolve this error.