ORA-39002: invalid operation
ORA-39174: Encryption password must be supplied.
The export dump is an encrypted one. I.e while taking export , ENCRYPTION_PASSWORD has been provided.
So for importing also, we need to pass the same password. So get the password and import as below.
impdp scott/tiger tables=oracledbwr directory=TEST_DIR dumpfile=oracledbwr.dmp logfile=oracledbwr.log remap_table=scott.oracledbwr:oracledbwr1 encryption_password=oracle123