Datasets not loading removing ckan files

[ken-senagi]

Hello CKAN community,

I removed ckanext-showcase files.

The Datasets page is not loading. It says
Server Error
An internal server error occurred

Error log: /var/log/apache2/ckan_default.error.log

[Fri May 21 10:04:39.542355 2021] [wsgi:error] [pid 54779:tid 139963181340416] [remote 127.0.0.1:16058] Error - <class 'routes.util.GenerationException'>: url_for can only return a string, got unicode instead: showcase_read?action=read&controller=package&id=animal-health-stats
[Fri May 21 10:04:39.560990 2021] [wsgi:error] [pid 54779:tid 139963181340416] 2021-05-21 10:04:39,560 INFO [ckan.lib.base] /dataset render time 0.017 seconds

Error log: /var/log/apache2$ sudo vim ckan_default.custom.log

27.0.0.1 - - [21/May/2021:10:16:36 +0000] "GET /dataset HTTP/1.0" 500 12051 "http://xxx/group" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0"
127.0.0.1 - - [21/May/2021:10:16:37 +0000] "GET /api/i18n/en HTTP/1.0" 200 192 "http://xxx/dataset" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0"
127.0.0.1 - - [21/May/2021:10:16:37 +0000] "POST /_tracking HTTP/1.0" 200 151 "http://xxx/dataset" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0"
209.141.48.117 - - [21/May/2021:10:16:53 +0000] "GET /manager/html HTTP/1.1\n" 400 0 "-" "-"

Anyone with a solution? Thank you in advance.