Metasploit RM Issues

I'm on Metasploit, Meterpreter and I've backdoored someone and I want to delete a file via a backdoor and here is the error I get:

Code:

rm -f /storage/sdcard0/download/Update.apk

stdapifsdeletefile: Operation failed: 1

I've Also tried a different variation of the command which is

Code:

rm -f Update.apk

stdapifsdeletefile: Operation failed: 1

I did this while in the download directory.

Someone help plz