PERL WAPI umlauts, Blackslash and empty space problems

[#1]

Hello,
we Couldnt import EA with umlauts using perl WAPI.
How can we resolve the issue
thanks:
WE get the failure as follows :

'{ "Error": "AdmConProtoError: JSON Decoding: \'utf8\' codec can\'t decode bytes in position 16-18: unexpected end of data",
  "code": "Client.Ibap.Proto.JSONDecoding",
  "text": "JSON Decoding: \'utf8\' codec can\'t decode bytes in position 16-18: unexpected end of data"
}'