Server Error: Please check your server logs or contact tech support. and displays error

I have installed erpnext on the vps port 8000.
When I click on Accounts or Sellings then a pop up display which says

Something went wrong
Close
Server Error: Please check your server logs or contact tech support.

The console display following error.

jquery.min.js:4 POST http://[ip]:8000/ 500 (INTERNAL SERVER ERROR)
send @ jquery.min.js:4
ajax @ jquery.min.js:4
frappe.request.call @ desk.min.js?ver=1506526859.0:1512
frappe.call @ desk.min.js?ver=1506526859.0:1406
show_section @ VM215:63
page.activate_link @ VM215:55
frappe.pages.modules.on_page_show @ VM215:153
trigger_page_event @ desk.min.js?ver=1506526859.0:9739
(anonymous) @ desk.min.js?ver=1506526859.0:9732
dispatch @ jquery.min.js:3
$event.dispatch @ report.min.js?ver=1506526859.0:3039
r.handle @ jquery.min.js:3
trigger @ jquery.min.js:4
(anonymous) @ jquery.min.js:4
each @ jquery.min.js:2
each @ jquery.min.js:2
trigger @ jquery.min.js:4
change_to @ desk.min.js?ver=1506526859.0:9482
(anonymous) @ desk.min.js?ver=1506526859.0:9697
with_page @ desk.min.js?ver=1506526859.0:9668
(anonymous) @ desk.min.js?ver=1506526859.0:9691
with_doctype @ desk.min.js?ver=1506526859.0:5480
show @ desk.min.js?ver=1506526859.0:9690
frappe.route @ desk.min.js?ver=1506526859.0:2177
(anonymous) @ desk.min.js?ver=1506526859.0:2292
dispatch @ jquery.min.js:3
$event.dispatch @ report.min.js?ver=1506526859.0:3039
r.handle @ jquery.min.js:3
desk.min.js?ver=1506526859.0:1613 Traceback (most recent call last):
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/app.py”, line 57, in application
response = frappe.handler.handle()
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/handler.py”, line 53, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/init.py”, line 923, in call
return fn(*args, **newargs)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/desk/moduleview.py”, line 14, in get
data = get_data(module)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/desk/moduleview.py”, line 29, in get_data
doctype_info = get_doctype_info(module)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/desk/moduleview.py”, line 128, in get_doctype_info
“custom”, “issingle”], order_by=“custom asc, document_type desc, name asc”)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/init.py”, line 1161, in get_all
return get_list(doctype, *args, **kwargs)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/init.py”, line 1134, in get_list
return frappe.model.db_query.DatabaseQuery(doctype).execute(None, *args, **kwargs)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/model/db_query.py”, line 88, in execute
result = self.build_and_run()
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/model/db_query.py”, line 112, in build_and_run
return frappe.db.sql(query, as_dict=not self.as_list, debug=self.debug, update=self.update)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/apps/frappe/frappe/database.py”, line 165, in sql
self._cursor.execute(query)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/env/lib/python2.7/site-packages/MySQLdb/cursors.py”, line 250, in execute
self.errorhandler(self, exc, value)
File “/var/sentora/hostdata/userhostdirref/public_html/erpnext/frappe-bench/env/lib/python2.7/site-packages/MySQLdb/connections.py”, line 50, in defaulterrorhandler
raise errorvalue
OperationalError: (1038, ‘Out of sort memory, consider increasing server sort buffer size’)

libs.min.js?ver=1506526859.0:7338 GET http://[ip]:9000/socket.io/?EIO=3&transport=polling&t=LxXBm86 net::ERR_CONNECTION_TIMED_OUT

Please provide a fix for this issue

Check below post

Thanks . Resolved it