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You'd better make a workspace and set the ROS_PACKAGE_PATH at there. Don't change something in /opt/ros.....

I have some compiling problem but just don't know why...... I successfully build some programs before but after I change something, all program just failed. Can anybody tell me what's this problem? very very thankful...

• Where: Build file '/home/wildfire/my_workspace/ajpf_ros/build.gradle' line: 11

• What went wrong: A problem occurred evaluating root project 'ajpf_ros'. Cause: Could not find method maven() for arguments [build_3bcu47ed6p0s77r3m7ndupfh7r$_run_closure1_closure3@1ec3c6d] on root project 'ajpf_ros'.

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 4.096 secs

I've checked other program and it seems like not a "gradle building problem". Is this error come from my wrong code? It's just a very simple one extended from tutorial.

The gradle.build is

apply plugin: 'java'

apply plugin: 'maven'

apply plugin: 'application'
mainClassName = 'org.ros.RosRun'

sourceCompatibility = 1.6
targetCompatibility = 1.6

repositories {
  mavenLocal()
  maven {
    url 'http://robotbrains.hideho.org/nexus/content/groups/ros-public'
  }
}

version = '0.0.0-SNAPSHOT'
group = 'ros.my_stack'

dependencies {
  compile 'ros.rosjava_core:rosjava:0.0.0-SNAPSHOT'
}

 wildfire@ubuntu:~/my_workspace/ajpf_ros$ gradle --version

 Gradle 1.0-milestone-3

 Gradle build time: Thursday, September
 8, 2011 4:06:52 PM UTC Groovy: 1.7.10
 Ant: Apache Ant(TM) version 1.8.2
 compiled on August 19 2011 Ivy: non
 official version JVM: 1.6.0_24 (Sun
 Microsystems Inc. 20.0-b12) OS: Linux
 3.0.0-24-generic i386

hi, I just start to try to connect my program to real robot, but I totally failed at checking out because the rosmake can't work. Who can tell me what this problem mean?

wildfire@ubuntu:~/my_workspace/nxt_lejos/nxt_lejos_msgs$ rosmake Could not detect OS. platform detection will not work [ rosmake ] No package specified. Building ['nxt_lejos_msgs']
[ rosmake ] Packages requested are: ['nxt_lejos_msgs']
[ rosmake ] Logging to directory/home/wildfire/.ros/rosmake/rosmake_output-20120823-012544 [ rosmake ] Expanded args ['nxt_lejos_msgs'] to: ['nxt_lejos_msgs']
[ rosmake ] Checking rosdeps compliance for packages nxt_lejos_msgs. This may take a few seconds. Traceback (most recent call last): File "/opt/ros/electric/ros/bin/rosmake", line 69, in <module> if rma.main(): File "/opt/ros/electric/ros/tools/rosmake/src/rosmake/engine.py", line 872, in main self.printer.print_all("rosdep check failed to find system dependencies: %s"% self.rosdep_check_result) TypeError: not all arguments converted during string formatting Traceback (most recent call last): File "/opt/ros/electric/ros/bin/rosmake", line 69, in <module> if rma.main(): File "/opt/ros/electric/ros/tools/rosmake/src/rosmake/engine.py", line 872, in main self.printer.print_all("rosdep check failed to find system dependencies: %s"% self.rosdep_check_result) TypeError: not all arguments converted during string formatting

Sorry I'm totally new to use ROS. I have had a java agent (program) which was used to control satellites and now I want to use it into ROS. I have read some documents and think it should be okay for the running concept of the ROS. After that, I've passed all tutorials of ROS but when I try to install rosjava_core, I meet some problems. I don't know why I can't install it. When I follow the "rosws update", it just tell me:

[rosjava_core] Installing https://code.google.com/p/rosjava (default) to /home/wildfire/Robtic_java_workspace/rosjava_core WARNING [vcstools] Command failed: 'hg --version' errcode: 127: /bin/sh: hg: not found [/vcstools] Exception caught during install: Error processing 'rosjava_core' : Unable to create vcs client of type hg for /home/wildfire/Robtic_java_workspace/rosjava_core: "Could not determine whether hg is installed 'hg --version returned 127, maybe hg is not installed'"

ERROR: Error processing 'rosjava_core' : Unable to create vcs client of type hg for /home/wildfire/Robtic_java_workspace/rosjava_core: "Could not determine whether hg is installed 'hg --version returned 127, maybe hg is not installed'"

Anyone can tell me what's this problem?