XML : C# - Deserialize an XML file with multiple ns

I've been in trouble trying to deserialize the following XML below. I have the error "There is an error in XML document (1, 2)". Any tips? Thanks in advance.

  <ns:obterControleDieselResponse>      <ns:return type="br.com.framew2.webservices.posicoes.RetornoDiesel">          <ax26:diesel type="br.com.framew2.webservices.posicoes.ControleDiesel">              <ax26:bomba>B01PTS</ax26:bomba>              <ax26:cliente>PTS TRANSPORTES</ax26:cliente>              <ax26:combustivel>DIESEL</ax26:combustivel>              <ax26:data_gps>2013-09-04T14:38:39.000Z</ax26:data_gps>              <ax26:datainicioabastecimento>2013-09-04T14:29:59.000Z</ax26:datainicioabastecimento>              <ax26:endereco>r aguilino limongi - 284 a 379 - itu - SP</ax26:endereco>              <ax26:evento_data>2013-09-04T14:29:59.000Z</ax26:evento_data>              <ax26:filial>PTS TRANSPORTES</ax26:filial>              <ax26:fornecido>2013-09-04T14:29:59.000Z</ax26:fornecido>              <ax26:frentista>RONALDO ORMONDE</ax26:frentista>              <ax26:frentista_id>0</ax26:frentista_id  ax26:horimetro_anterior>0</ax26:horimetro_anterior>          <ax26:horimetro_atual>9</ax26:horimetro_atual>          <ax26:id>7702</ax26:id>          <ax26:id_veiculo>53549</ax26:id_veiculo>          <ax26:km_anterior>0</ax26:km_anterior>          <ax26:km_atual>0</ax26:km_atual>          <ax26:licenca>DAH4974</ax26:licenca>          <ax26:litros>0.0</ax26:litros>          <ax26:motorista/>          <ax26:numero>3061353</ax26:numero>          <ax26:numero_sequencia>0</ax26:numero_sequencia>          <ax26:numeroidveiculo_str>9671765</ax26:numeroidveiculo_str>          <ax26:placa>DAH4974</ax26:placa>          <ax26:tanque>TQ1PTS</ax26:tanque>          <ax26:tempo>520</ax26:tempo>          <ax26:valor_arla>0.0</ax26:valor_arla>          <ax26:valor_lubrificante>0.0</ax26:valor_lubrificante>      </ax26:diesel>  </ns:return>  </ns:obterControleDieselResponse>