how to solve the problem with extrinsic error here?

Hello,

Get an following error message by using this code.

Simulink does not have enough information to determine output sizes for this block. If you think the errors below are inaccurate, try specifying types for the block inputs and/or sizes for the block outputs.
Component:MATLAB Function | Category:Coder error
Expected either a logical, char, int, fi, single, or double. Found an mxArray. MxArrays are returned from calls to the MATLAB interpreter and are not supported inside expressions. They may only be used on the right-hand side of assignments and as arguments to extrinsic functions.

function x= fcn(u, y,A1,L1,b,C)

coder.extrinsic('evalin')
coder.extrinsic('evalin')
coder.extrinsic('sscanf')
coder.extrinsic('fgets')

fileID = fopen("result.txt", "r");
file = fgets(fileID)

value = sscanf(file, '%g', [1,2]) %

x1 = value(1,1)
x2 = value(1,2)
value=double([x1;x2])
if value(1,1) < 1   
x3=[10;20];
end

x_predicted=A1*x3+b*u 
x_est1=x_predicted+L1*(y-C'*x_predicted)%Filterung

x3 = x_est1

x_est = x_est1;

What is the problem here?

[tret retret]

something wrong with

value