v1812 decmopose

[danao]

在v1812里，使用了 cyclic boundary

preservePatches
(LEFT RIGHT)
(TOP DOWN);

decompose时报错：

--> FOAM Warning : 
    Using 'preservePatches' constraint specification.
    This constraint keyword is deemed to be 54 months old.

--> FOAM FATAL IO ERROR: 
Entry 'preservePatches' has 4 excess tokens in stream

    8(( LEFT RIGHT ) ( TOP DOWN ))

怎么回事