Running HARP example design returns error value -54.

I modify the host code of example design.

The original part in launching the first kernel is

status = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, gsize, lsize, 0, NULL, NULL)

I modify this part to

// define NDRange Size
size_t gsize[1]={(size_t) 10};
size_t lsize[1] = {(size_t) 2};
status = clEnqueueNDRangeKernel(queue, kernel, 1, NULL,  gsize, lsize, 0, NULL, NULL)

Then I run the code it returns error code -54. Why can't I increase the 1-d lsize to 2?