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My input was

$CONTRL SCFTYP=RHF DFTTYP=B2PLYP DFTD=.T. d5=.T. RUNTYP=OPTIMIZE $END                 
$DFTD VERSN=3 $END                                                             
$SYSTEM TIMLIM=3000 MEMORY=30000000 $END                                       
$BASIS EXTFIL=.T.  GBASIS=acc-pvdz $END                                       
$STATPT HSSEND=.T. NPRT=-2 $END                                                
$FORCE NVIB=2 VIBSIZ=0.005 $END                                                
$DATA                                                                          
 H2O                                                                             
C1                                                                              
O  8.0                   -3.46278   2.54045   0.                                
H  1.0                  -2.50278   2.54045   0.                                 
H  1.0                  -3.78324   3.44539   0.                                 
 $END                                                 

I am getting the following error:
FATAL ERROR: DFTTYP = B2PLYP DOES NOT YET HAVE GRADIENTS PROGRAMMED.

So is it not possible to perform optimization with this functional?

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In original GAMESS-US code there are no analytic gradients for "double hybrids" and it looks like it is true for Firefly as well. You can use numerical gradients by adding NUMDER=.T. in $CONTRL section. See this for details.

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