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I just ran into this problem and solved it. The important things to note are the following areas within the native library:

CV_Assert(nimages > 0 && dims > 0);
CV_Assert(rsz == dims*2 || (rsz == 0 && images.depth(0) == CV_8U));
CV_Assert(csz == 0 || csz == dims);

dims is the number of elements in the histSize vector, rsz is the range vector size, and csz is the channel vector size. Looking at your code we can see that the third assertion fails because the channel size (your channels vector) is of size 3, but the size of your histSize vector is only 1! So what you should do is change

MatOfInt histSize=new MatOfInt(256);

to

MatOfInt histSize=new MatOfInt(256, 256, 256);

now of course you will get an assertion error on the second assertion in the native code above, so you should then notice that your ranges vector must be modified to satisfy the requirement of rsz == dims*2, in other words, specify a range for each bucket like so:

 MatOfFloat ranges=new MatOfFloat(0.0f,255.0f, 0.0f, 255.0f, 0.0f, 255.0f);

Hope this helps

I just ran into this problem and solved it. The important things to note are the following areas within the native library:

CV_Assert(nimages > 0 && dims > 0);
CV_Assert(rsz == dims*2 || (rsz == 0 && images.depth(0) == CV_8U));
CV_Assert(csz == 0 || csz == dims);

dims is the number of elements in the histSize vector, rsz is the range vector size, and csz is the channel vector size. Looking at your code we can see that the third assertion fails because the channel size (your channels vector) is of size 3, but the size of your histSize vector is only 1! So what you should do is change

MatOfInt histSize=new MatOfInt(256);

to

MatOfInt histSize=new MatOfInt(256, 256, 256);

now of course you will get an assertion error on the second assertion in the native code above, so you should then notice that your ranges vector must be modified to satisfy the requirement of rsz == dims*2, in other words, specify a range for each bucket like so:

 MatOfFloat ranges=new MatOfFloat(0.0f,255.0f, 0.0f, 255.0f, 0.0f, 255.0f);

Hope this helps