Cannot use some apps

For titanium backup, this is the message.
The current backup location("/storage/sdcard0//TitaniumBackup") cannot be accessed.

For the gallery, this is the message.
No external storage available


Can any help me on this problem?

Is a CyanogenMod base bug.

Hi alessandro. it seems like the the problem is the defult location where to find the files/folder. is there a plan plan to fix this bug?