***I changed the pypsa-eur config.json to new countries/timespan etc. but my output does not change.**
***I changed the pypsa-eur config.json to new countries/timespan etc. but my output does not change.**
* In pypsa-eur, there are several files, which must be changed, when changing the config. To make sure, everything is updated to your change, delete all files in networks, resources and results.
* In pypsa-eur, there are several files, which must be changed, when changing the config. To make sure, everything is updated to your change, delete all files in networks, resources and results.
***When executing pypsa-eur I get an error because of a package.**
***When executing pypsa-eur I get an error because of a package.**
* There might be a problem with the package itself or the package has been updated but it doesn't work with pypsa-eur, yet. E.g. there is a known issue with ipopt which throws the error message "Could not locate the 'ipopt' executable, which is required for solver ipopt" (22.12.2020). To solve this you should remove the current package version (e.g. `conda remove ipopt`) and install an older version that is know to work (e.g. `conda install -c conda-forge ipopt=3.11.1`).
* There might be a problem with the package itself or the package has been updated but it doesn't work with pypsa-eur, yet. E.g. there is a known issue with ipopt which throws the error message *"Could not locate the 'ipopt' executable, which is required for solver ipopt"* (22.12.2020). To solve this you should remove the current package version (e.g. `conda remove ipopt`) and install an older version that is know to work (e.g. `conda install -c conda-forge ipopt=3.11.1`).
