how to understand error of web panel module?

[shital chande]

Hi,

I am using a web panel module and that showing error.
screen shot->

Error : Error rendering ‘com.vps.jira.plugin.Archiving-Attachment:archiving-indicator’. Please contact your Jira administrators.

ArchivingIndicator.java ->
public Map<String,Object> getContextMap(ApplicationUser user, JiraHelper jiraHelper)
{
String get=Optional.ofNullable(“myinput”).orElse("");
Map<String, Object> contextMap = Maps.newHashMap();
//Map contextMap = new HashMap();
Issue currentIssue = (Issue)jiraHelper.getContextParams().get(“issue”);
CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
//CustomField cf = customFieldManager.getCustomFieldObjectByName(“Group Picker”);
CustomField cf = customFieldManager.getCustomFieldObject(“Group Picker”);
Object val = currentIssue.getCustomFieldValue(cf).toString();
log.error(“CustomField VAlue@@@@”+val);
if(val == null || val =="")
{
contextMap.put(“daysAwayFromDueDate”, currentIssue);
log.error(currentIssue+"@@@***");
return contextMap;
}
else
{
return contextMap;
}}

using JIRA 7.13.0.
anyone help me I don’t understand why an exact error has occurred?