I recently installed the Infant FreeSurfer package. When I try to run 

infant_recon_all (specific command: infant_recon_all --s SUBJ --age AGE)

 I get the error 

if: Expression Syntax

I tried switching shells from bash to tcsh but got the same error.

The FreeSurfer version is freesurfer-infant-20200205

My platform is Ubuntu 18.04

Any suggestions how to fix this?

Kind regards,

Fleur