Can any interpretation be advised for the error message: Unable to define a matrix over 'Dom::Expr​essionFiel​d()'.

Dear colleagues,

I have prepared m-file to find out the roots of a pair of multivariable equations, each equation is formed by two variables (n1 & n2) and consists of more than 100 terms and the maximum order of each equation is 11. After a long investigation, the methodology to find these roots is confirmed to be numeric analysis employing Newton Raphson technique. I‘ve written the m-file in Matlab implementing Newton Raphson technique through loops of “FOR”. Part of the m-file is attached. I can say that 60% of the loops' iterations have been executed before I got the error message. The program run for approximately 24 hours before it stopped with the following error message:

Error using symengine
Unable to define a matrix over 'Dom::ExpressionField()'.
Error in sym/subsref (line 843)
B = mupadmex('symobj::subsref',L.s,privformat(R_tilde));
Error in Code_v06 (line 315)
if (0<ERR(1,1))&&(ERR(1,1)<1e15)&&(0<ERR(2,1))&&(ERR(2,1)<1e-15)

Can anybody help me in interpreting the error and advise the solution? I am going to run the m- file several times corresponding to new parameters values? Can any solution be advised for such error?

[Walter Roberson]

Maybe it is related to:

https://www.mathworks.com/help/symbolic/mupad_ref/matrix.html

"matrix cannot handle arrays that have uninitialized entries, and responds with an error message:

matrix(b)

Error: Unable to define a matrix over 'Dom::ExpressionField()'. [(Dom::Matrix(Dom::ExpressionField()))::new]"

Or perhaps you ran out of memory.

It is much easier for us to test if you post code instead of an image of code.