Internal Server Error when change/delete columns

[julio1501]

I get teh error 500 when trying to edit/delete columns.
here is the content of the the poll directory

ls -l
insgesamt 4
lrwxrwxrwx 1 www-data www-data 20 Mär 7 2018 access_control.cgi -> ../access_control.rb
lrwxrwxrwx 1 www-data www-data 10 Mär 7 2018 atom.cgi -> ../atom.rb
lrwxrwxrwx 1 www-data www-data 15 Mär 7 2018 customize.cgi -> ../customize.rb
-rw-rw---- 1 www-data www-data 376 Mär 7 2018 data.yaml
lrwxrwxrwx 1 www-data www-data 17 Mär 7 2018 delete_poll.cgi -> ../delete_poll.rb
lrwxrwxrwx 1 www-data www-data 18 Mär 7 2018 edit_columns.cgi -> ../edit_columns.rb
lrwxrwxrwx 1 www-data www-data 13 Mär 7 2018 history.cgi -> ../history.rb
lrwxrwxrwx 1 www-data www-data 17 Mär 7 2018 index.cgi -> ../participate.rb
lrwxrwxrwx 1 www-data www-data 25 Mär 7 2018 invite_participants.cgi -> ../invite_participants.rb
-rw-r--r-- 1 www-data www-data 0 Mär 7 2018 last_read_access
lrwxrwxrwx 1 www-data www-data 18 Mär 7 2018 notification.cgi -> ../notification.rb
lrwxrwxrwx 1 www-data www-data 14 Mär 7 2018 overview.cgi -> ../overview.rb

output git log:

commit 2c3378aeea4984dfff68aa011249ff19dce60309
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:40 2018 +0100

Column 2018-03-09 14:00 edited

commit af29782608254223f890f22e06440d9b0ad4ef43
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:39 2018 +0100

Column 2018-03-08 10:00 edited

commit d91257a398f39c656f25a4f7219a1cea63d155c4
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:27 2018 +0100

Column 2018-03-09 added

commit c713ef7b5be2a5e79f37c60d1cb6b297aaf5b1e0
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:26 2018 +0100

Column 2018-03-08 added

commit b874260a4bdd4af7c3b87d75eb329156fa00d2f8
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:25 2018 +0100

Column 2018-03-07 added

commit d487f853ce1aafe903285e3bd298757938c1a4a6
Author: www-data www-data@srv17089.dmz01.local
Date: Wed Mar 7 18:05:22 2018 +0100

Poll Termin created

output data.yaml

--- !ruby/object:Poll
name: Termin
head: !ruby/object:TimePollHead
data:

!ruby/object:TimeString
date: 2018-03-07
time:
!ruby/object:TimeString
date: 2018-03-08
time: 2018-03-08 10:00:00.000000000 +01:00
!ruby/object:TimeString
date: 2018-03-09
time: 2018-03-09 14:00:00.000000000 +01:00
data: {}
comment: []

Apache2 error:

AH01215: NoMethodError: /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
AH01215: ): /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
AH01215: \tfrom /var/www/dudle/timepollhead.rb:63:in ==': /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi AH01215: \tfrom /var/www/dudle/timepollhead.rb:63:in !=': /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
AH01215: \tfrom /var/www/dudle/timepollhead.rb:63:in delete_concrete_column': /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi AH01215: \tfrom /var/www/dudle/timepollhead.rb:79:in delete_column': /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
AH01215: \tfrom /var/www/dudle/ow4ukapx/edit_columns.cgi:38:in `
': /var/www/dudle/ow4ukapx/edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
End of script output before headers: edit_columns.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi
AH00128: File does not exist: /var/www/var/www/dudle/error.cgi, referer: https:///dudle/ow4ukapx/edit_columns.cgi

I need help
Best regards