while passing to a function in Prime31 throws error

I have to use a function in Prime31 for requestiong product data in ios. The function is

 var iosProductIds = new string[] { "com.something.dollar"};
  
 IAP.requestProductData( iosProductIds, androidSkus, productList =>
 {
   Debug.Log( "Product list received" );
   Utils.logObject( productList );
 });

its working fine.

But if a extract a value from array named "pArray" and declared it as a variable

 var pid = pArray [0];

and passing to function as

 string[] stringArray = new string[1];
 stringArray[0] =pid ;
 var iosProductIds = stringArray;

throws error "StoreKit: invalid productIdentifier: com.something.dollar" .

I tried

 string pid = pArray [0];

 

also. But stucked with same error.

How can i clear it? Please help