Hi
This is an error from the make file saying that it can't find the compiler command (although the error messages are not very easy to understand...).
This means that, although you have installed the compiler, the environment has not been configured so that the process executing the make file knows where it is. The easiest way of solving this is to edit the file Build_SAM7X.bat in \Applications\uTaskerV1.4\GNU_SAM7X
Here is the original path entry, which enters this path when the bat file is started so that the directory is searched for the commands
SET PATH=%PATH%;C:/Program Files/CodeSourcery/Sourcery G++ Lite/bin
Modify it to suit the location where you have installed the compiler on your PC. In the bin directory you should find the exe files like arm-none-eabi-gcc1.exe etc.
Another possibility is that the environment variable is fine (eg. CodeSourcery changed this during installation) but the name of the compiler has changed in this version. In this case, open the make file make_uTaskerV1.4_GNU_SAM7X in \Applications\uTaskerV1.4\GNU_SAM7X in an editor and change the following to suit the names in your installation:
CC = arm-none-eabi-gcc
CC_OBJ = arm-none-eabi-objcopy
CC_SIZE = arm-none-eabi-size
Regards
Mark