Unable to install module simplesamlphp/simplesamlphp-assets-base - Error when upgrading to D10

I got around this issue removing the simplesamlphp_auth module via composer, updating core to 10 and then requiring the simplesamlphp_auth module again. Closing the issue.

I'm having the same issue, I have uninstalled simplesamlphp_auth but now I get a different error:

Uninstall of simplesamlphp/composer-module-installer failed
In PluginManager.php(274) : eval()'d code line 60:

  [Error]
  Call to protected method SimpleSAML\Composer\ModuleInstaller::getPackageBasePath() from scope Simpl
  eSAML\Composer\ModuleInstallerPlugin_composer_tmp8

Resolved

I was having the same issue as bbombachini
I resolved the issue by removing the vendor folder and then running 'composer update'
If this helps anyone else.

Noted in https://github.com/simplesamlphp/simplesamlphp/issues/1853 that you have to upgrade the simplesamlphp/composer-module-installer dependency first before you can upgrade simplesamlphp/simplesamlphp.

Thanks for these recent troubleshooting notes. In my case, the upgrade to simplesamlphp/composer-module-installer would not apply for some reason, so the deletion of /vendor/ after having set the new requirement on it to ^1.3 finally worked.

echoing in: removing vendor directory is the only thing that worked.

I just removed the vendor folder and then worked properly.

After removing /Vendor folder, do we need to run "composer update"?

@SatheeshGopal,

Yes, After removing 'vendor' folder, need to run "composer update"

I removed the vendor folder and then ran the composer installation. It works perfectly.