My octave program showed the following error. How can I remove that error? I loaded 'symbolic ’ package in octave.

syms F1(x,y,z) F2(x,y,z) F3(x,y,z) r1(t) r2(t) r3(v)
r1(t)=cos(t);
r2(t)=sin(t);
r3(v)=v;
F1=y;
F2=zx;
F3=xy;
r=[r1;r2;r3];
F=[F1;F2;F3];
Fr= dot(F,r);
dr= diff(r,t);
integrand = dot(Fr,dr);
error: Python exception: AttributeError: ‘Add’ object has no attribute ‘dot’
occurred at line 4 of the Python code block:
return a.dot(b, hermitian=True, conjugate_convention=“left”)
error: called from
pycall_sympy__ at line 178 column 7
dot at line 70 column 5

while someone here may be able to assist, you may get a more direct response over at the package github issue tracker: Issues · cbm755/octsympy · GitHub