Ardweeny error messages.

Arduino: 1.6.1 (Windows 8.1), Board: "Arduino Duemilanove or Diecimila, ATmega328"

Sketch uses 1,030 bytes (3%) of program storage space. Maximum is 30,720 bytes.

Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.

avrdude: ser_open(): can't open device "\\.\COM5": The system cannot find the file specified.

Problem uploading to board.  See for suggestions.

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When I try uploading just the blink program to my Ardweeny through FTDI I get these errors. It used to work in the old arduino 1.5 but I installed 1.6 and it doesnt want to work anymore... Whats wrong?