Please help me debug my Java code!

These are the errors I got:

HW$2\_$Tester.java:$206$: error: cannot find symbol

MathVector sum $=$ new MathVector$($vectors$[0].$getDimension$())$;

$^$

symbol: variable vectors

location: class MathVector

HW$2\_$Tester.java:$207$: error: cannot find symbol

for$($Mathvector vectors : vectors$)\{$

$^$

symbol: variable vectors

location: class MathVector

HW$2\_$Tester.java:$207$: error: cannot find symbol

for$($Mathvector vectors : vectors$)\{$

$^$

symbol: class Mathvector

location: class MathVector

$3$ errors

error: compilation failed

This is my code:

class MathVector $\{$

private final int dim;

private final double$[]$ values;

public MathVector$($int N$)\{$

this.dim $=$ N;

this.values $=$ new double$[$dim$]$;

$\}$

public MathVector$($double$...$ arr$)\{$

dim $=$ arr.length;

values $=$ new double$[$dim$]$;

for $($int i $=0$; i $<$ dim; i$++)\{$

values$[$i$]=$ arr$[$i$]$;

$\}$

$\}$

public MathVector$($MathVector v$)\{$

$//$this$($v$.$values$)$

dim $=$ v$.$dim;

values $=$ new double$[$dim$]$;

for $($int i $=0$; i $<$ dim; i$++)\{$

values$[$i$]=$ v$.$values$[$i$]$;

$\}$

$\}$

public static MathVector vec$2$DfromPolar$($double r$,$ double theta$)\{$

double x $=$ r $*$ Math.cos$($theta$)$;

double y $=$ r $*$ Math.sin$($theta$)$;

return new MathVector$($x$,$y$)$;

$\}$

public static MathVector vec$3$DfromPolar$($double r$,$ double theta, double phi$)\{$

double x $=$ r $*$ Math.sin$($theta$)*$ Math.cos$($phi$)$;

double y $=$ r $*$ Math.sin$($theta$)*$ Math.sin$($phi$)$;

double z $=$ r $*$ Math.cos$($theta$)$;

return new MathVector$($x$,$ y$,$ z$)$;

$\}$

public int getDimension$()\{$

return dim;

$\}$

public double getValue$($int idx$)\{$

return values$[$idx$-1]$;

$\}$

public void setValue$($int idx, double val$)\{$

values$[$idx$-1]=$ val;

$\}$

public double dotWith$($MathVector other$)\{$

double dotProd $=0$;

for$($int i $=0$; i