Redmine

If i open the Gantt Tab the following Error will be shown:

An error occurred while executing the query and has been logged. Please report this error to your Redmine administrator.

This is what the log says:

Started GET "/redmine/projects/buerosystemhaus-schaefer/issues/gantt" for 127.0.0.1 at 2020-01-14 17:08:37 +0100
Processing by GanttsController#show as HTML
  Parameters: {"project_id"=>"buerosystemhaus-schaefer"}
  Current user: t.pitzer (id=5)
  Rendering gantts/show.html.erb within layouts/base
  Rendered queries/_filters.html.erb (9.2ms)
  Rendered queries/_columns.html.erb (2.4ms)
  Rendered gantts/show.html.erb within layouts/base (54.0ms)
Query::StatementInvalid: TinyTds::Error: A column has been specified more than once in the order by list. Columns in the order by list must be unique.: EXEC sp_executesql N'SELECT  [issues].[id] AS t0_r0, [issues].[tracker_id] AS t0_r1, [issues].[project_id] AS t0_r2, [issues].[subject] AS t0_r3, [issues].[description] AS t0_r4, [issues].[due_date] AS t0_r5, [issues].[category_id] AS t0_r6, [issues].[status_id] AS t0_r7, [issues].[assigned_to_id] AS t0_r8, [issues].[priority_id] AS t0_r9, [issues].[fixed_version_id] AS t0_r10, [issues].[author_id] AS t0_r11, [issues].[lock_version] AS t0_r12, [issues].[created_on] AS t0_r13, [issues].[updated_on] AS t0_r14, [issues].[start_date] AS t0_r15, [issues].[done_ratio] AS t0_r16, [issues].[estimated_hours] AS t0_r17, [issues].[parent_id] AS t0_r18, [issues].[root_id] AS t0_r19, [issues].[lft] AS t0_r20, [issues].[rgt] AS t0_r21, [issues].[is_private] AS t0_r22, [issues].[closed_on] AS t0_r23, [issue_statuses].[id] AS t1_r0, [issue_statuses].[name] AS t1_r1, [issue_statuses].[is_closed] AS t1_r2, [issue_statuses].[position] AS t1_r3, [issue_statuses].[default_done_ratio] AS t1_r4, [projects].[id] AS t2_r0, [projects].[name] AS t2_r1, [projects].[description] AS t2_r2, [projects].[homepage] AS t2_r3, [projects].[is_public] AS t2_r4, [projects].[parent_id] AS t2_r5, [projects].[created_on] AS t2_r6, [projects].[updated_on] AS t2_r7, [projects].[identifier] AS t2_r8, [projects].[status] AS t2_r9, [projects].[lft] AS t2_r10, [projects].[rgt] AS t2_r11, [projects].[inherit_members] AS t2_r12, [projects].[default_version_id] AS t2_r13, [projects].[default_assigned_to_id] AS t2_r14, [users].[id] AS t3_r0, [users].[login] AS t3_r1, [users].[hashed_password] AS t3_r2, [users].[firstname] AS t3_r3, [users].[lastname] AS t3_r4, [users].[admin] AS t3_r5, [users].[status] AS t3_r6, [users].[last_login_on] AS t3_r7, [users].[language] AS t3_r8, [users].[auth_source_id] AS t3_r9, [users].[created_on] AS t3_r10, [users].[updated_on] AS t3_r11, [users].[type] AS t3_r12, [users].[identity_url] AS t3_r13, [users].[mail_notification] AS t3_r14, [users].[salt] AS t3_r15, [users].[must_change_passwd] AS t3_r16, [users].[passwd_changed_on] AS t3_r17, [trackers].[id] AS t4_r0, [trackers].[name] AS t4_r1, [trackers].[is_in_chlog] AS t4_r2, [trackers].[position] AS t4_r3, [trackers].[is_in_roadmap] AS t4_r4, [trackers].[fields_bits] AS t4_r5, [trackers].[default_status_id] AS t4_r6, [trackers].[description] AS t4_r7, [enumerations].[id] AS t5_r0, [enumerations].[name] AS t5_r1, [enumerations].[position] AS t5_r2, [enumerations].[is_default] AS t5_r3, [enumerations].[type] AS t5_r4, [enumerations].[active] AS t5_r5, [enumerations].[project_id] AS t5_r6, [enumerations].[parent_id] AS t5_r7, [enumerations].[position_name] AS t5_r8, [issue_categories].[id] AS t6_r0, [issue_categories].[project_id] AS t6_r1, [issue_categories].[name] AS t6_r2, [issue_categories].[assigned_to_id] AS t6_r3, [versions].[id] AS t7_r0, [versions].[project_id] AS t7_r1, [versions].[name] AS t7_r2, [versions].[description] AS t7_r3, [versions].[effective_date] AS t7_r4, [versions].[created_on] AS t7_r5, [versions].[updated_on] AS t7_r6, [versions].[wiki_page_title] AS t7_r7, [versions].[status] AS t7_r8, [versions].[sharing] AS t7_r9 FROM [issues] INNER JOIN [projects] ON [projects].[id] = [issues].[project_id] INNER JOIN [issue_statuses] ON [issue_statuses].[id] = [issues].[status_id] LEFT OUTER JOIN [users] ON [users].[id] = [issues].[assigned_to_id] LEFT OUTER JOIN [trackers] ON [trackers].[id] = [issues].[tracker_id] LEFT OUTER JOIN [enumerations] ON [enumerations].[id] = [issues].[priority_id] AND [enumerations].[type] IN (N''IssuePriority'') LEFT OUTER JOIN [issue_categories] ON [issue_categories].[id] = [issues].[category_id] LEFT OUTER JOIN [versions] ON [versions].[id] = [issues].[fixed_version_id] WHERE (projects.status <> 9 AND EXISTS (SELECT 1 AS one FROM enabled_modules em WHERE em.project_id = projects.id AND em.name=''issue_tracking'')) AND ((issues.status_id IN (SELECT id FROM issue_statuses WHERE is_closed=0)) AND projects.lft >= 3 AND projects.rgt <= 18)  ORDER BY projects.lft ASC, issues.id ASC, issues.id DESC OFFSET 0 ROWS FETCH NEXT @0 ROWS ONLY', N'@0 int', @0 = 500
  Rendering common/error.html.erb within layouts/base
  Rendered common/error.html.erb within layouts/base (0.1ms)
Completed 500 Internal Server Error in 91ms (Views: 13.2ms | ActiveRecord: 12.9ms)

Installed on:
Windows Server 2016
Windows SQL Express 2017

Only Plugin i installed is the Checkbox-Plugin