Login page unavailable after grefana restart

Hi,
I restarted grafana and now unable to login, get the following message:
template: index:83:19: executing “index” at <.MainNavLinks>: can’t evaluate field MainNavLinks in type *dtos.IndexViewData

in grafana.log:

t=2018-11-14T12:08:41+0300 lvl=info msg=“Starting Grafana” logger=server version=5.3.2 commit=0d821d0 compiled=2018-10-24T15:06:27+0300
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config loaded from” logger=settings file=/usr/share/grafana/conf/defaults.ini
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config loaded from” logger=settings file=/etc/grafana/grafana.ini
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config overridden from command line” logger=settings arg=“default.paths.data=/var/lib/grafana”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config overridden from command line” logger=settings arg=“default.paths.logs=/var/log/grafana”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config overridden from command line” logger=settings arg=“default.paths.plugins=/var/lib/grafana/plugins”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Config overridden from command line” logger=settings arg=“default.paths.provisioning=/etc/grafana/provisioning”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Path Home” logger=settings path=/usr/share/grafana
t=2018-11-14T12:08:41+0300 lvl=info msg=“Path Data” logger=settings path=/var/lib/grafana
t=2018-11-14T12:08:41+0300 lvl=info msg=“Path Logs” logger=settings path=/var/log/grafana
t=2018-11-14T12:08:41+0300 lvl=info msg=“Path Plugins” logger=settings path=/var/lib/grafana/plugins
t=2018-11-14T12:08:41+0300 lvl=info msg=“Path Provisioning” logger=settings path=/etc/grafana/provisioning
t=2018-11-14T12:08:41+0300 lvl=info msg=“App mode production” logger=settings
t=2018-11-14T12:08:41+0300 lvl=info msg=“Writing PID file” logger=server path=/var/run/grafana/grafana-server.pid pid=4227
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing SqlStore” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Connecting to DB” logger=sqlstore dbtype=sqlite3
t=2018-11-14T12:08:41+0300 lvl=info msg=“Starting DB migration” logger=migrator
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing HTTPServer” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing SearchService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing PluginManager” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Starting plugin search” logger=plugins
t=2018-11-14T12:08:41+0300 lvl=eror msg=“Plugins: Failed to load plugin json file: /usr/share/grafana/public/app/plugins/datasource/testdata/plugin.json, err: Plugin with same id already exists”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Registering plugin” logger=plugins name=“Pie Chart”
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing InternalMetricsService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing AlertingService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing CleanUpService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing NotificationService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing ProvisioningService” logger=server
t=2018-11-14T12:08:41+0300 lvl=eror msg=“can’t read datasource provisioning files from directory” logger=provisioning.datasources path=/etc/grafana/provisioning/datasources
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing RenderingService” logger=server
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing TracingService” logger=server
t=2018-11-14T12:08:41+0300 lvl=eror msg=“can’t read dashboard provisioning files from directory” logger=provisioning.dashboard path=/etc/grafana/provisioning/dashboards
t=2018-11-14T12:08:41+0300 lvl=info msg=“Initializing Stream Manager”
t=2018-11-14T12:08:41+0300 lvl=info msg=“HTTP Server Listen” logger=http.server address=0.0.0.0:3000 protocol=http subUrl= socket=