求助求助，在数据拟合的时候出现问题

wholedata = {{0, 394, 372, 11.02`}, {28, 394, 372, 12.7`}, {56, 394, 372, 14.56`}, {84, 394, 372, 6.17`}, {112, 394, 372, 17.25`}, {168, 394, 372, 22.59`}, {224, 394, 372, 21.63`}, {280, 394, 372, 19.34`}, {336, 394, 372, 16.12`}, {392, 394, 372, 14.11`}, {224, 0, 372, 6.39`}, {224, 49, 372, 9.48`}, {224, 98, 372, 12.46`}, {224, 147, 372, 14.33`}, {224, 196, 372, 17.1`}, {224, 294, 372, 21.94`}, {224, 394, 372, 22.64`}, {224, 489, 372, 21.34`}, {224, 587, 372, 22.07`}, {224, 685, 372, 24.53`}, {224, 394, 0, 15.75`}, {224, 394, 47, 16.76`}, {224, 394, 93, 16.89`}, {224, 394, 140, 16.24`}, {224, 394, 168, 17.56`}, {224, 394, 279, 19.2`}, {224, 394, 372, 17.97`}, {224, 394, 465, 15.84`}, {224, 394, 554, 20.11`}, {224, 394, 651, 19.4`}};
model = NonlinearModelFit[lbk]wholedata,
a*n^b*p^c*k^d, {a, b, c, d}, {n, p, k}[rbk];
为什么会出现下面这个，该怎么改进