Dump error after calling a global class from se24

this is the small code i did so far.
parameters: X type i,
                  Y type i.
data: Z type i.
data: con1 type ref to ZTEST1.
CALL METHOD con1->zm1
EXPORTING
    a      = x
    b      = y
IMPORTING
    c      = z.
write:/ z.
after executing iam getting a dump error-
An exception occurred that is explained in detail below.
The exception, which is assigned to class 'CX_SY_REF_IS_INITIAL', was not
caught and
therefore caused a runtime error.
The reason for the exception is:
You attempted to use a 'NULL' object reference (points to 'nothing')
access a component (variable: "CON1").
An object reference must point to an object (an instance of a class)
before it can be used to access components.
Either the reference was never set or it was set to 'NULL' using the
CLEAR statement.

Hi, Could you please tell me how to solve this issue?

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Dump error after calling a global class from se24

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