[rules-users] Not able to detect how to correct ERR 102

[ankit3j]

Below is a sample DSLR code I am trying out. Now I am getting error in "when"
block. After hours of trying to search for a solution I have not yet been
able to detect the error.

package com.sample
import com.sample.*;
//expander sample.dsl
rule "hello rule"
        when
                There is a "$customer" with first name "David"  // This is
where the error is
        then
                Greet Customer
end

[ERR 102] Mismatched input "is" in rule "hello rule"

Any idea whats wrong with this line?? 



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