Einstein's Work-units don't start up anymore

In the stderr file I get this message: what does it mean, what can I do about it?

2008-06-01 21:45:58.5674 [normal]: Start of BOINC application 'C:\\Program Files\\BOINC\\projects\\einstein.phys.uwm.edu\\einstein_S5R3_4.26_windows_intelx86.exe'.
Can't set up shared mem: -1
Will run in standalone mode.
2008-06-01 21:45:58.5987 [debug]: Set up communication with graphics process.
2008-06-01 21:45:58.5987 [CRITICAL]: Required user-variable `DataFiles1` has not been specified!

Level 0: $Id: HierarchicalSearch.c,v 1.189 2007/11/29 13:42:05 bema Exp $
Function call `LALUserVarReadAllInput(&status, argc, argv)' failed.
file HierarchicalSearch.c, line 501

Level 1: $Id: UserInput.c,v 1.44 2007/11/25 19:52:59 badri Exp $
Status code -1: Recursive error
function LALUserVarReadAllInput, file UserInput.c, line 840

Level 2: $Id: UserInput.c,v 1.44 2007/11/25 19:52:59 badri Exp $
Status code 8: Required user-variable was not set
function LALUserVarCheckRequired, file UserInput.c, line 893
2008-06-01 21:45:58.5987 [CRITICAL]: BOINC_LAL_ErrHand(): now calling boinc_finish()
called boinc_finish