Stupid mistake that causes TNS-12533: TNS:illegal ADDRESS parameters during tns names resolution

Consider the following tnsnames.ora file:

cdb =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = myserver1.oric.no)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = cdb)
    )
  )


 pdb1 =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = myserver1.oric.no)(PORT = 1521))
      (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = pdb1.oric.no)
        (INSTANCE_NAME = cdb)
      )
    )

A tnsping against the cdb would return

 tnsping cdb

Used parameter files:
$ORACLE_HOME/network/admin/sqlnet.ora


Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = myserver1.oric.no)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = cdb))) pdb1 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = myserver1.oric.no)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = pdb1.oric.no) (INSTANCE_NAME = cdb) ) )
TNS-12533: TNS:illegal ADDRESS parameters

For the pdb1 the error was:

TNS-03505: Failed to resolve name

The solution is simple: open tnsnames.ora in an editor and remove the blank space erroniously indented before "pdb1":

 pdb1 =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = myserver1.oric.no)(PORT = 1521))
      (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = pdb1.oric.no)
        (INSTANCE_NAME = cdb)
      )
    )

Make sure every tnsnames.ora entry starts at the very left end of the file, and this problem goes away.