Hello Sankar,
the HANA trial instance on HCP has some restriction. For example it is not possible to create new schemas.
There is one specific schema (NEO_<unique_id>) in which you can create catalog objects (e.g. tables). You can find out your schema by selecting the schema name from view "HCP"."HCP_DEV_METADATA".
But you wanna create attribute views and calculation views. For that I would recommend to create repository objects within the respository view. There exists a package <your trial account>/<your trial instance> under the Content node. Within that you can create these objects. By using procedure "HCP"."HCP_GRANT_SELECT_ON_ACTIVATED_OBJECTS" you can make the runtime object of the view(s) visible within schema _SYS_BIC.
Please have a look to documentation Using a SAP HANA Trial Instance and especially Specific Procedures and Views for SAP HANA Trial Instance. It is also worth to have a look to blog post 8 Easy Steps to Develop an XS application on the SAP HANA Cloud Platform.
Best Regards,
Florian