keil uv2的问题

lostbooker

今天准备编译一个cypress usb2.0的固件程序，在按照要求配置好软件及添加相应文件后，出现如下错误，到网上找了一圈相似的问题，答案五花八门，没有解决，不知道班里有没有兄弟遇到过类似的，谢~
Build target 'firmware'
" l0 y1 i9 ^) v2 J' e& @assembling STARTUP.A51...
$ V4 C% S: |; |4 Yassembling dscr.a51...
. c$ B4 N  |1 n* y2 b0 ccompiling fw.c...
compiling periph.c...
" o& I7 K1 I( Y$ E6 x6 aassembling USBJmpTb.a51...
6 B/ ]/ E8 g7 V" I$ U( F5 X* r$ {linking...
5 W0 p6 S" t* X- lBL51 BANKED LINKER/LOCATER V5.12 - SN: K1DZP-5IUSHE
9 _6 x0 e0 j# ~) u: a; F: A+ CCOPYRIGHT KEIL ELEKTRONIK GmbH 1987 - 2004
3 Q2 B  z9 C' d# u"STARTUP.obj",
7 J6 [9 s1 t- V$ p9 ~& I0 g"dscr.obj",
"fw.obj",
"periph.obj",
: R( B. s8 \- B1 _"USBJmpTb.obj",
& D$ g  e! t$ A2 n$ \1 M# N".\lib\EZUSB.LIB"
TO "fw"
, U0 ^7 f# a! E; X7 g: |RAMSIZE(256)
4 T& G5 ]! _) p2 q) [  p. iCODE( 0X0000-0X1FFF )
XDATA( 0XE000-0XE1FF )
% u* T$ R2 r) w  Q) i. H$ g4 r0 R  w*** FATAL ERROR L210: I/O ERROR ON INPUT FILE:
' l9 X3 h/ \) F! H2 ]    EXCEPTION 0021H: PATH OR FILE NOT FOUND
, l3 v2 {' h! ^, q% [7 E5 l* A* V    FILE: C:\KEIL\C51\BIN\C51S.LIB
Target not created