Unrecognized VM option '+UseCodeCacheFlushing at pycharm startup

Hi,

I just upgraded to PyCharm 2.7, but although (I think) I'm using the right Java version I get the error shown below:

$ java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Server VM (build 14.3-b01, mixed mode)

$ which java
/usr/bin/java

$ pycharm-2.7/bin/pycharm.sh
Unrecognized VM option '+UseCodeCacheFlushing'
Could not create the Java virtual machine.

Any ideas?

Thanks,

Ralph