ORA-44001: invalid schema

I have an Oracle database dump which contains the dump of three schemas for e.g. alpha bravo charlie in one file, exported through EXPDP.

Now when I am trying to import these with the following command:

IMPDP alpha/alpha FULL=Y DUMPFILE=alpha06022014.dmp LOGFILE=alpha.log;

…after a couple of lines I get this error which is probably because I am supplying the credentials of only one schema in the command?

...
...
...

ORA-31684: Object type VIEW:"alpha"."table1" already exists
ORA-31684: Object type VIEW:"alpha"."object" already e
xists
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PUT_DDL [VIEW:"bravo"."
VW_NDC_CONFIG_REPLY"]
ORA-44001: invalid schema

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 6273

----- PL/SQL Call Stack -----
  object      line  object
  handle    number  name
25BA9BC0     14916  package body SYS.KUPW$WORKER
25BA9BC0      6300  package body SYS.KUPW$WORKER
25BA9BC0     12689  package body SYS.KUPW$WORKER
25BA9BC0     11968  package body SYS.KUPW$WORKER
25BA9BC0      3279  package body SYS.KUPW$WORKER
25BA9BC0      6889  package body SYS.KUPW$WORKER
25BA9BC0      1262  package body SYS.KUPW$WORKER
25A03A14         2  anonymous block

Job "alpha"."SYS_IMPORT_FULL_02" stopped due to fatal error at 11:26:41

D:oracleproduct10.2.0client_1BIN>

If yes, then how can I import all three schemas?.

To import data into a different schema you need to grant IMP_FULL_DATABASE role to the user. Oracle MOS Doc ID 351598.1.

Or you can use SYS user:

impdp '/ as sysdba' FULL=Y DUMPFILE=alpha06022014.dmp LOGFILE=alpha.log