请教老师如何修FPGA编译错误

我用的是lattice&nbsp;isp7.0,用VHDL,编译时出现错误如下:<br />feed&nbsp;mux&nbsp;creatde&nbsp;for&nbsp;signal&nbsp;aaa,did&nbsp;you&nbsp;forget&nbsp;the&nbsp;set/reset&nbsp;assignment&nbsp;for&nbsp;this&nbsp;signal.<br />can't&nbsp;find&nbsp;the&nbsp;control&nbsp;for&nbsp;aaa.