Oracle Golden Gate Pump failed with ERROR OGG-01496

One of the Golden gate Pump failed with "OGG-01496" error message as mentioned below.

2015-06-20 05:51:15  ERROR   OGG-01496  Oracle GoldenGate Capture for Oracle, pump1.prm:  Failed to open target trail file ./dirdat/g1000531, at RBA 25867744.

2015-06-20 05:51:15  ERROR   OGG-01668  Oracle GoldenGate Capture for Oracle, pump1.prm:  PROCESS ABENDING.

Keyword in the error message is "Failed to open target trail file".

This means pump is not able to place files in the target File system.  

Logged in the target server and found that "./dirdat/" FS was unmounted. 

Mounted the FS in the Target and Started the pump at source.