Java imports failing

The following imports:

import commvault.cte.workflow.activities.HttpClient;
import commvault.cte.workflow.types.WebRequest;
import commvault.cte.workflow.types.NameValue;
import commvault.cte.workflow.types.WebMethod;

Produces the following:

Script1.groovy: 8: unable to resolve class commvault.cte.workflow.types.WebRequest
 @ line 8, column 1.
   import commvault.cte.workflow.types.WebRequest;
   ^

Script1.groovy: 9: unable to resolve class commvault.cte.workflow.types.NameValue
 @ line 9, column 1.
   import commvault.cte.workflow.types.NameValue;
   ^

Script1.groovy: 10: unable to resolve class commvault.cte.workflow.types.WebMethod
 @ line 10, column 1.
   import commvault.cte.workflow.types.WebMethod;
   ^