matlab - Filter is too large

Hi I'm trying to separate sound from music using wfilters and heard each part separately using its name scale3 function

function s = scale3(q,n)
   p = length(q);
    if p==n 
       s = q;
      else 
      s = resample(q,n,p);
     end

the program

 s = wavread('K:\Khaleel_3aaza (1).wav'); % whatever here
 [l,h] = wfilters('sym2','d');
 [z.x]=wavedec(s,2,l,h);

 -> p = scale3(z.x(25000:40000),45000);

And the function in the program I apply with wfilters and filter works well until approximately 20,000 but the values ​​of the file that I'm working it the larger, and the music begins approximately 3,000 when I ues more than 30000 or more give me this error

??? Error using ==> upfirdnmex
  Filter length is too large - reduce problem complexity.


 Error in ==> upfirdn at 86
 Y = upfirdnmex(x,h,p,q,Lx,Lh,hCols,nChans);

 Error in ==> resample at 106
  y = upfirdn(x,h,p,q);

 Error in ==> scale3 at 6
  s = resample(q,n,p);


  Error in ==> Untitled2 at 7
  p = scale3(z.x(25000:40000),45000);

I don't understand what that means ? ang how I can fix it thank you for help