To fix this error you should 1st try to run an auto reference - this can be done from Lab Advisor-Chemstation or MassHunter
In Lab Advisor it is under under configure-detect drawers/auto referencing
In the Chemstation or Masshunter right click and Modify-drawer configuration- see below
Make sure all plates have been removed and taken out of configuration-
Here is the Multisamper User Manual https://www.agilent.com/cs/library/usermanuals/public/1290Infinity_Multisampler-B_USR_EN.pdf
If this does not work please call your local service office as you may have an issue with the transport assembly.