Couldn't Find dfc.data.dir in dfc.properties file

I am getting this error message at client machine, whenevr I tried to execute the code in Eclipse.

Error Message:
''/opt/Documentum'' is an invalid value for the property dfc.data.dir
Or
0 [main] WARN com.documentum.fc.common.DfLogger - Failed to load
log4j.properties. Using default log4j configuration
Or
Couldn't Find dfc.data.dir in dfc.properties file

Resolution:

For eclipse follow below steps:
1) Right click on project folder -> Properties
2) Click on Java Build Path -> Click on Libraries tab -> Add Variable
3) Click on configure variable
4) Click on New
5) Enter "config" in Name
6) select the c:\documentum\config folder