Why I can not add grid field and configure it in table grid next generation?

[JIRA2020]

It is error log jira:

2020-10-13 11:13:40,346 http-nio-8081-exec-155 ERROR <username> 673x1106914x2 10dvisl 192.168.12.95 /rest/idalko-grid/1.0/grid/info/field [c.a.p.r.c.error.jersey.ThrowableExceptionMapper] Uncaught exception thrown by REST service: Could not initialize class com.idalko.tgng.jira.server.models.duckets.grid.customfield.ServerGridFieldInfo$
java.lang.NoClassDefFoundError: Could not initialize class com.idalko.tgng.jira.server.models.duckets.grid.customfield.ServerGridFieldInfo$
at com.idalko.tgng.jira.server.controllers.grid.customfield.GridFieldInfoController.getGridFieldInfos(GridFieldInfoController.scala:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
... 18 filtered
at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:159)
... 1 filtered
at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:69)
... 39 filtered
at com.atlassian.servicedesk.internal.web.ExternalCustomerLockoutFilter.doFilter(ExternalCustomerLockoutFilter.java:55)
... 16 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 52 filtered
at net.youngaweb.jira.ServletFilter.doFilter(ServletFilter.java:381)
... 15 filtered
at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
at com.atlassian.jira.security.JiraSecurityFilter$$Lambda$2151/333646996.doFilter(Unknown Source)
... 1 filtered
at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
... 18 filtered
at com.atlassian.plugins.rest.module.servlet.RestSeraphFilter.doFilter(RestSeraphFilter.java:37)
... 20 filtered
at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
... 6 filtered
at com.idalko.tgng.jira.server.models.servicedesk.ServletRequestContextFilter.$anonfun$doFilter$1(ServletRequestContextFilter.scala:13)
at com.idalko.tgng.jira.server.models.servicedesk.ServletRequestContextFilter$$Lambda$1622/1416266643.apply$mcV$sp(Unknown Source)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
at scala.util.Try$.apply(Try.scala:209)
at com.idalko.tgng.jira.server.models.servicedesk.ServletRequestContextFilter.doFilter(ServletRequestContextFilter.scala:13)
... 4 filtered
at com.idalko.jira.plugins.igrid.servicedesk.ServletRequestContextFilter.doFilter(ServletRequestContextFilter.java:23)
... 4 filtered
at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.lambda$invokeFilterChain$0(CustomerContextSettingFilter.java:183)
at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter$$Lambda$1247/820221257.call(Unknown Source)
at com.atlassian.servicedesk.internal.api.util.context.ReentrantThreadLocalBasedCodeContext.rteInvoke(ReentrantThreadLocalBasedCodeContext.java:136)
at com.atlassian.servicedesk.internal.api.util.context.ReentrantThreadLocalBasedCodeContext.runOutOfContext(ReentrantThreadLocalBasedCodeContext.java:89)
at com.atlassian.servicedesk.internal.utils.context.CustomerContextServiceImpl.runOutOfCustomerContext(CustomerContextServiceImpl.java:47)
at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.outOfCustomerContext(CustomerContextSettingFilter.java:174)
at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.doFilterImpl(CustomerContextSettingFilter.java:126)
at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.doFilter(CustomerContextSettingFilter.java:115)
... 11 filtered
at com.atlassian.jwt.internal.servlet.JwtAuthFilter.doFilter(JwtAuthFilter.java:37)
... 4 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 5 filtered
at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
... 27 filtered
at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
... 25 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

Can anybody help me?

what I do?