CMake Error Findurdf.cmake

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Hi,

I'm running the UR5-package on indigo against Ubuntu 14.04. Everything works fine, but since a while I get the following error when catkin_make my workspace.

CMake Error at /opt/ros/indigo/share/kdl_parser/cmake/kdl_parserConfig.cmake:165 (find_package):
  By not providing "Findurdf.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "urdf", but
  CMake did not find one.

  Could not find a package configuration file provided by "urdf" with any of
  the following names:

    urdfConfig.cmake
    urdf-config.cmake

  Add the installation prefix of "urdf" to CMAKE_PREFIX_PATH or set
  "urdf_DIR" to a directory containing one of the above files.  If "urdf"
  provides a separate development package or SDK, be sure it has been
  installed.
Call Stack (most recent call first):
  /opt/ros/indigo/share/moveit_core/cmake/moveit_coreConfig.cmake:165 (find_package)
  /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:75 (find_package)
  universal_robot/ur_kinematics/CMakeLists.txt:4 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/geissler/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/geissler/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

I did not knowingly change anything. Anybody knows where that does come from?

Best regards

P.S.: please note I'm a beginner concerning ROS...