No module named 'monorun.ops.least_squares._ext'

[东城]

There is a error named "No module named 'monorun.ops.least_squares._ext'", when I run the code.
How can I solve it, please.

[Hansheng Chen]

This indicates that the PnP lib is not found. You can follow INSTALL.md to build the PnP module.

[东城]

Thank you for your approach. I installed the wrong version of the Ceres, but now I have a new problem when follow INSTAll.md.
This is "gcc: error: /config:没有这个文件或目录", when I run "python setup.py" in "Clone and build".

[Hansheng Chen]

Can you show the full error message?

[东城]

(monorun) dl@dl:~/code/zzm/monorun/monorun/ops/least_squares$ python setup.py
gcc: error: /config: 没有那个文件或目录
Traceback (most recent call last):
File "setup.py", line 21, in
os.getenv('Ceres_DIR') + '/lib/libceres.so'],
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

[Hansheng Chen]

Please export these environment variables after installing Ceres as instructed in INSTALL.md

export CERES_INCLUDE_DIRS=$PWD/include
export Ceres_DIR=$PWD/build

and don't switch the terminal before finishing building the PnP module

[东城]

This is a point that deserves special attention.
In this way, I ran the code successfully and hope no problems tomorrow.
Thank you very much for your patience.