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RuntimeError:

Model class msv.core.models.Post doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

do u have an app called core?

with this question, I understand. Now, do not work CSS, java scripts in the admin panel and can not install nginx

you don't need to install nginx. we already do all that stuff for you. for the css and js to work, you need to run collectstatic and then set the static settings in the webapps tab, so that the url /static points to where you collected the static files.

collectstatic launched, in the webapps tab url /static are registered

Did collectstatic put the files where you expected it to? Does your static mapping refer to that directory? Does your static mapping url agree with the url where you're trying to load your resources from?

RuntimeError at / Model class astana.models.Course doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

How to solve this error on pythonanaywhere ?

It looks like you're trying to use a model that is not in installed app and doesn't have an app_label.