i have an error using plot function with syms engine

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I have an error like below,

Error using plot

Data must be numeric, datetime, duration or an array convertible to double.

Error in pressuremodel (line 36)

plot(a,K1,'.-b');

my code is:

%% pressure at crack wake due to bridgindg after application of remote stress
clc
close all
clear
a=0.001:0.0002:0.0018;
syms x a w
%x=1.0:0.1:1.98;
Ef=427000*10^6; % in Pa
Em=89000*10^6;
Ec=184000*10^6;
%mu=0.2825;
%v=0.36;
ao=0.001;
w=0.00512;
%R=.0725;
S=198*10^6;
%tow=20;
m1=0.6147+17.1844*(a.^2./w^2)+8.7822*(a.^6./w^6);
m2=0.2502+3.2889*(a.^2./w^2)+70.0444*(a.^6./w^6);
H=(1+m1*((a-x)./a)+m2*((a-x)./a).^2);
c=S*((w./(w-ao))+6*w*ao*((0.5*(w-ao)-(x-ao))./(w-ao)^3));
j=int((S*H)./(sqrt(a-x)), [0 ao]);
L=int(((S-c)*H)./(sqrt(a-x)), [ao a]);
K=sqrt(2/3.14)*(j+L);
K1=((K*(Em./(Ec)))./10^7);
plot(a,K1,'.-b');