Hi everybody, I'm new in this forum and I hope I'm doing everything right...

I'm trying to use neural network built with Neuroph Studio in RapidMiner. It seems I've installed the plug-in correctly since I can finde the neurophRM oparator but when I make the process running I get a Porcess failure error message even if the setup does not seem to contain any obvious errors...
Can anybody give me a hand with this?
Thanks a lot!!!
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.008">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="5.3.008" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="read_excel" compatibility="5.3.008" expanded="true" height="60" name="Read Excel" width="90" x="45" y="30">
<parameter key="excel_file" value="C:\ITT\Progetti\Modellizzazione\neuroph-2.7\Concrete cpx\Concrete_Normalised_Data70.xls"/>
<parameter key="imported_cell_range" value="A1:I1031"/>
<parameter key="first_row_as_names" value="false"/>
<list key="annotations">
<parameter key="0" value="Name"/>
</list>
<list key="data_set_meta_data_information">
<parameter key="0" value="Cement (component 1)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="1" value="Blast Furnace Slag (component 2)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="2" value="Fly Ash (component 3)(kg in a m^3 mixture).true.integer.attribute"/>
<parameter key="3" value="Water (component 4)(kg in a m^3 mixture).true.real.attribute"/>
<parameter key="4" value="Superplasticizer (component 5)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="5" value="Coarse Aggregate (component 6)(kg in a m^3 mixture).true.real.attribute"/>
<parameter key="6" value="Fine Aggregate (component 7)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="7" value="Age (day).true.numeric.attribute"/>
<parameter key="8" value="Concrete compressive strength(MPa, megapascals) .true.real.label"/>
</list>
</operator>
<operator activated="true" class="neuroph:neuroph_regression" compatibility="0.1.001" expanded="true" height="76" name="Neuroph Regression NN" width="90" x="179" y="30">
<parameter key="nn_file" value="C:\ITT\Progetti\Modellizzazione\neuroph-2.7\Concrete cpx\Neural Networks\ConcreteCPX.nnet"/>
</operator>
<operator activated="true" class="read_excel" compatibility="5.3.008" expanded="true" height="60" name="Read Excel (2)" width="90" x="179" y="165">
<parameter key="excel_file" value="C:\ITT\Progetti\Modellizzazione\neuroph-2.7\Concrete cpx\Concrete_Normalised_Data30test.xls"/>
<parameter key="imported_cell_range" value="A1:I1031"/>
<parameter key="first_row_as_names" value="false"/>
<list key="annotations">
<parameter key="0" value="Name"/>
</list>
<list key="data_set_meta_data_information">
<parameter key="0" value="Cement (component 1)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="1" value="Blast Furnace Slag (component 2)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="2" value="Fly Ash (component 3)(kg in a m^3 mixture).true.integer.attribute"/>
<parameter key="3" value="Water (component 4)(kg in a m^3 mixture).true.real.attribute"/>
<parameter key="4" value="Superplasticizer (component 5)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="5" value="Coarse Aggregate (component 6)(kg in a m^3 mixture).true.real.attribute"/>
<parameter key="6" value="Fine Aggregate (component 7)(kg in a m^3 mixture).true.numeric.attribute"/>
<parameter key="7" value="Age (day).true.numeric.attribute"/>
<parameter key="8" value="Concrete compressive strength(MPa, megapascals) .true.real.label"/>
</list>
</operator>
<operator activated="true" class="apply_model" compatibility="5.3.008" expanded="true" height="76" name="Apply Model" width="90" x="380" y="30">
<list key="application_parameters"/>
</operator>
<operator activated="true" class="write_excel" compatibility="5.3.008" expanded="true" height="76" name="Write Excel" width="90" x="514" y="120">
<parameter key="excel_file" value="C:\ITT\Progetti\Modellizzazione\neuroph-2.7\Concrete cpx\Testdataminer.xlsx"/>
<parameter key="file_format" value="xlsx"/>
<parameter key="number_format" value="#.00"/>
</operator>
<connect from_op="Read Excel" from_port="output" to_op="Neuroph Regression NN" to_port="training set"/>
<connect from_op="Neuroph Regression NN" from_port="model" to_op="Apply Model" to_port="model"/>
<connect from_op="Read Excel (2)" from_port="output" to_op="Apply Model" to_port="unlabelled data"/>
<connect from_op="Apply Model" from_port="labelled data" to_op="Write Excel" to_port="input"/>
<connect from_op="Apply Model" from_port="model" to_port="result 1"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="sink_result 1" spacing="0"/>
<portSpacing port="sink_result 2" spacing="0"/>
</process>
</operator>
</process>