Error when Computing the euclidean dietance between tow color histograms

Question

Hi

please any one help me to solve my proplem:

  I compute the color histogram for both image database (THisto) and Query image (QHisto)then I used Euclidean distance to compute the distance between them in order to retrieve the similar one. when I run the program I get the following error: THisto and  QHisto) must be 2 Dimension 

Please, not that I use Matlab