Converting Issues

Hello, 

I keep getting the below message: 

• The specified file temporary://transactions_081018_13.csv could not be moved, because the destination is invalid. More information is available in the system log.
• Error moving file

I have never had this message. There is also nothing different I have done. 

Is this a temporary issue? 

Please Advise. 

Thank you, 

Helen Mendiola