I use EPM900 as parallel programmer. In programmer setting of micro vision2 environment, I've chosen "Use configuration from START900.A51". When I clicked Flash download, following error message displayed: *** LPC900 EPM Loader V1.01 *** LPC900 EPM Programmer V1.03 Flash Erase Done: 7 sectors erased. Flash Write Done: 1237 bytes programmed. Flash Verify Done: 1237 bytes verified. *** Error: Write Configuration failed. Wrong or missing START900.A51 why did it happen? if I didn't choose "Use configuration from START900.A51", programming was successful. The START900.A51 was auto included by micro vision2 during creating project and wasn't modified.