Can't compile Taskintro

Folks:

I have just installed Orocos on my computer and it went just perfect. After it, I tried to compile the
taskintro demo, and somehow it fails to make. The output is shown below:

root@dell:/home/edu/codigo/task-intro-0.24.0# make
g++ -c -Wall -g `PKG_CONFIG_PATH=/usr/local/orocos/lib/pkgconfig pkg-config oroc os-gnulinux --cflags`
TaskIntro.cxx -o taskintro.o
WaitingTaskContext.hpp: In constructor ‘WaitingTaskContext::WaitingTaskContext(c onst std::string&)’:
WaitingTaskContext.hpp:59: error: invalid conversion from ‘int’ to ‘ORO_CoreLib: :AttributeBase*’
WaitingTaskContext.hpp:59: error:   initializing argument 2 of ‘bool ORO_Executi
on::AttributeRepository::addConstant(const std::string&, ORO_CoreLib::AttributeB ase*)’
make: ** [taskintro.o] Erro 1

I don't know where I did wrong. I am a beginner in Orocos so maybe this is a stupid question. Anyway, any help
would be welcome! 

Thanks,
Eduardo Silva