Is there a way to import an application exported from Appian 6.6.1and import in

Although this is definitely not going to solve your problem of using the unsupported approach of importing a 6.6.1 one app in 6.6 you need to make sure you have configured the primary data source correctly to take advantage of the new features that require the data source.

Take a look at the beginning of the application server log, if the configuration is right you will see something like this:

Validating and initializing the primary data source: java:/AppianPrimaryDS
[java:/AppianPrimaryDS] Checking schema and migrating if necessary...
[java:/AppianPrimaryDS] Schema check/migration completed successfully.
...

Although this is definitely not going to solve your problem of using the unsupported approach of importing a 6.6.1 one app in 6.6 you need to make sure you have configured the primary data source correctly to take advantage of the new features that require the data source.

Take a look at the beginning of the application server log, if the configuration is right you will see something like this:

Validating and initializing the primary data source: java:/AppianPrimaryDS
[java:/AppianPrimaryDS] Checking schema and migrating if necessary...
[java:/AppianPrimaryDS] Schema check/migration completed successfully.
...