Hi Lin Kui, we get the same error message, but already while running autodock3. Therefore I would like to ask you to send me your makefile. I would then let you know of any differences between your and our makefile. Yours Edgar -- Edgar Luttmann University of Paderborn, Germany Department of organic chemistry office: J6.302 Warburger Str. 100 phone: (+49) 5251 60-2498 33098 Paderborn eMail: edgar : at : upb.de