Error in sym>tomupad

Dear All,

Can you please help me with this problem? I can't run the DSGE model in matlab (the code is from the author of paper and it was writen in 2008)

Error using sym>convertChar (line 1448)

Character vectors and strings in the first argument can only specify a variable ornumber. To evaluate character vectors and strings representing symbolicexpressions, use 'str2sym'.

Error in sym>tomupad (line 1214)

S = convertChar(x);

Error in sym (line 211)

S.s = tomupad(x);

Error in subs (line 68)

r_unique_name = subs(sym(f_unique_name),varargin{:});

Error in SYMLOG_NCC (line 26)

eqI = subs(eqI,{'Ra1','a','w','F','R'},{Ra1,a,w,F,R});

Error in RBC_NCC (line 14)

SYMLOG_NCC;