pulse collector is not starting up

[Sudherson Nadar]

Hi Everyone,
i tried to  start the pulse collector ,on doing so it is giving me the following error:
Collector: CfgServer connection closed.

I checked all the connections to configuration server,it is running fine.

when i checked the logs it is giving me following error:

2016-04-22 00:37:21.617 (3376) Warning: Schedule(116): (996) There is no connection to the data source [0].
2016-04-22 00:37:21.632 (10484) FileSnapshotTransport: FSTW-0: Writing Snapshot Schedule(151) TenantId (1) Type [Full] FTime [1461310641] UTime [1461310641] (1 rows)(0 excl.)(11 cols.)(1 msg.)'.
2016-04-22 00:37:21.648 (3376) SnapshotBuilder: SBW-0: Building snapshot for Schedule(121) (Full)
2016-04-22 00:37:21.648 (3376) Error: Schedule(121): (989) Failed to compute value for the formula-based statistic 'Reason'. Scripting engine error: Reason(Line 1, Col 66): Uncaught TypeError: Cannot call method 'split' of null.
2016-04-22 00:37:21.648 (3376) Error: Schedule(121): (989) Failed to compute value for the formula-based statistic 'Reason'. Scripting engine error: Reason(Line 1, Col 66): Uncaught TypeError: Cannot call method 'split' of null.