base operand of ‘->’ has non-pointer type ‘cv::Mat’

[ibrahimqazi]

Can you please help me to troubleshoot this problem. I am using Ubuntu 18.04 and ROS is Melodic. When I compile the stack it gives me the following error.

/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp: In member function ‘int CVG::Matrix::pseudoinverse(CVG::Matrix*)’:
/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp:279:13: error: base operand of ‘->’ has non-pointer type ‘cv::Mat’
    sourceAux->data.fl[(fila-1)*numColumnas+columna-1]=matA->getValueData(fila,columna);
             ^~
/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp:283:32: error: ‘CV_SVD’ was not declared in this scope
     cvInvert(sourceAux,pinvAux,CV_SVD); //CV_SVD
                                ^~~~~~
/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp:283:32: note: suggested alternative: ‘CV_SSE’
     cvInvert(sourceAux,pinvAux,CV_SVD); //CV_SVD
                                ^~~~~~
                                CV_SSE
/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp:283:5: error: ‘cvInvert’ was not declared in this scope
     cvInvert(sourceAux,pinvAux,CV_SVD); //CV_SVD
     ^~~~~~~~
/home/ibrrahim/catkin_workspaces/aerostack_catkin_ws/src/aerostack_stack/stack/libraries/lib_cvgutils/src/source/matrixLib.cpp:288:32: error: base operand of ‘->’ has non-pointer type ‘cv::Mat’
    Matrix::setValueData(pinvAux->data.fl[(fila-1)*numColumnas+columna-1],fila,columna);

Your help will be highly appreciated. @jespestana @joselusl

[pasanci]

Your errors are related to opencv 4.0, untill we update this issues for the next aerostack release, i suggest you to use an older version of opencv with the command: sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1 You should then roll back to the original code, that you modified in #70 and everything should be working just fine.

[ibrahimqazi]

Your errors are related to opencv 4.0, untill we update this issues for the next aerostack release, i suggest you to use an older version of opencv with the command: sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1 You should then roll back to the original code, that you modified in #70 and everything should be working just fine.

Thank you for your answer, so which version of OpenCV is compatible with your stack ? Thank you

[ibrahimqazi]

Your errors are related to opencv 4.0, untill we update this issues for the next aerostack release, i suggest you to use an older version of opencv with the command: sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1 You should then roll back to the original code, that you modified in #70 and everything should be working just fine.

@pasanci hello, any updates about this issue, does it work with OpenCV4? or which version is compatible with aerostack? I am stuck here. Thank you

[pasanci]

@ibrahimqazi as i mentioned in this response, opencv 3.2.0 should work, you must install it with the command provided.

Your errors are related to opencv 4.0, untill we update this issues for the next aerostack release, i suggest you to use an older version of opencv with the command: sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1 You should then roll back to the original code, that you modified in #70 and everything should be working just fine.

[ibrahimqazi]

@pasanci thank you but this command does work. sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1 [sudo] password for ibrrahim: Reading package lists... Done Building dependency tree Reading state information... Done libopencv-dev is already the newest version (3.2.0+dfsg-4ubuntu0.1). The following packages were automatically installed and are no longer required: gyp libc-ares2 libgflags-dev libgflags2.2 libgoogle-glog-dev libgoogle-glog0v5 libhttp-parser2.7.1 libjs-async libjs-inherits libjs-node-uuid libmbim-glib4 libmbim-proxy libqmi-glib5 libqmi-proxy linux-hwe-5.4-headers-5.4.0-51 linux-hwe-5.4-headers-5.4.0-52 linux-hwe-5.4-headers-5.4.0-53 linux-hwe-5.4-headers-5.4.0-58 linux-hwe-5.4-headers-5.4.0-60 node-abbrev node-ansi node-ansi-color-table node-archy node-async node-balanced-match node-block-stream node-brace-expansion node-combined-stream node-concat-map node-cookie-jar node-delayed-stream node-forever-agent node-form-data node-fs.realpath node-fstream node-fstream-ignore node-github-url-from-git node-glob node-graceful-fs node-hosted-git-info node-inflight node-inherits node-ini node-isexe node-json-stringify-safe node-lockfile node-lru-cache node-mime node-minimatch node-mkdirp node-mute-stream node-node-uuid node-nopt node-npmlog node-once node-osenv node-path-is-absolute node-pseudomap node-qs node-read node-request node-retry node-rimraf node-semver node-sha node-slide node-spdx-correct node-spdx-expression-parse node-spdx-license-ids node-tar node-tunnel-agent node-underscore node-validate-npm-package-license node-which node-wrappy node-yallist nodejs nodejs-doc usb-modeswitch usb-modeswitch-data Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.

I still get the compilation error.

[pasanci]

@ibrahimqazi The command has properly installed the required package. However since the problem continues, all i can think about is trying to completely remove possible opencv remains with the commands : sudo apt-get purge 'opencv'

And:

sudo find / -name "opencv" -exec rm -rf {} \;

Then once again install the required version with:

sudo apt -y --allow-downgrades install libopencv-dev=3.2.0+dfsg-4ubuntu0.1

If this does not fix the issue, i can only suggest you to try with a fresh ubuntu 18 and ros melodic installation, which is guaranteed to work out of the box.