[求助]matlab中这句提示错误句子是什么意思？

Error using ==> sym/maple
Error, (in Im/cos) too many levels of recursion

Error in ==> D:\MATLAB6p5\toolbox\symbolic\@sym\int.m
On line 51 ==> r = maple('map','int',f,[x.s '=' a.s '..' b.s]);
怎么解决呢？