rosbuild error bad current directory

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Hello,

I'm just started to learn ROS. I'm set the package as in beginner tutorial (but my package name is firstpackage). The erros when I type make is the following

mkdir -p bin
cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=`rospack find rosbuild`/rostoolchain.cmake  ..
[rosbuild] Building package firstpackage
CMake Error at /opt/ros/electric/ros/core/rosbuild/private.cmake:110 (message):
[rosbuild] rospack found package "firstpackage" at "", but the current directory is "/home/unais/workspace_ros/firstpackage".  You should
double-check your ROS_PACKAGE_PATH to ensure that packages are found in the
correct precedence order.
Call Stack (most recent call first):
  /opt/ros/electric/ros/core/rosbuild/public.cmake:180 (_rosbuild_check_package_location)
CMakeLists.txt:12 (rosbuild_init)


-- Configuring incomplete, errors occurred!
make: *** [all] Error 1

Qn : What would be the error? I don't know how to set my path currectly

This is my .bashrc file

The last some lines are this

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
    . /etc/bash_completion
fi
source /opt/ros/fuerte/setup.bash

### Added by the Heroku Toolbelt
export PATH="/usr/local/heroku/bin:$PATH"

PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting
export ROS_PACKAGE_PATH=~/workspace_ros:$ROS_PACKAGE_PATH
export ROS_PACKAGE_PATH=~/gspeech-master:$ROS_PACKAGE_PATH

export ROS_PACKAGE_PATH=~/fuerte_workspace/sandbox/beginner_tutorials:$ROS_PACKAGE_PATH
export ROS_PACKAGE_PATH=~/beginner_tutorials:$ROS_PACKAGE_PATH
source /opt/ros/electric/setup.bash
source /opt/ros/electric/setup.bash