Function works with LIVE but not with PLAYBACK - different dimensions?

Hi forum!,
I am working on a project in which we have a function to set the weights and bias for an artificial neural network. It works perfectly fine when we use it LIVE. But when we try PLAYBACK there is an error with the dimensions.
Do you know if LIVE and PLAYBACK need different processings in the code?
Below is the function that has the error. It is in line "tempW[rowCount][i] = float(weightArray[i]);" and the error is ArrayIndexOutOfBoundsException. For this reason I think that there might be a difference in the dimensions of the data source.

I hope you can help me with this!
Thanks in advance,
Agustina

void setWeightsAndBias(String wFName, String bFName, int nLayer){
    BufferedReader weightsReader = createReader(this.wbDir+ wFName + ".csv");
    BufferedReader biasReader = createReader(this.wbDir + bFName + ".csv");
    String line = null;
    int rowCount = 0;
    LayerConnection_Bias layer = this.layers.get(nLayer);
    int WRows = layer.getWeights().length ;
    int WCols = layer.getWeights()[0].length;
    float[][] tempW = new float[WRows][WCols];
    float[] tempBias = new float[WCols];

    try{
      // Read and set weights
      while ((line = weightsReader.readLine()) != null){
          String[] weightArray = split(line, ",");
          for (int i=0; i < WCols; i++){  // one row of weights
          //println(i);
             tempW[rowCount][i] = float(weightArray[i]);
             //println(weightArray[i]);
          }
          rowCount++;
            if (rowCount == WRows){
           //   Mat.print(tempW, 3);
              this.layers.get(nLayer).setWeights(tempW);
            }          
        }
      // Read and set bias
      int i = 0;
      while ((line = biasReader.readLine()) != null){
             tempBias[i] = float(line);
             i++;    
        }  
        this.layers.get(nLayer).setBias(tempBias);

    }catch(IOException e){
      e.printStackTrace();
    }
  }