1538385 - Error: "Exception in formula '{@Formula name}' at 'StoreStringVar': UFL 'u25store.dll' that implements this function is missing." when viewing report in Crystal Reports

• Error in formula when refreshing report in Crystal Reports.
• After migrating reports developed in older version of Crystal Reports, an error message is displayed as: 
        
  "Exception in formula '{@Formula name}' at 'StoreStringVar': UFL 'u25store.dll' that implements this function is missing."

• SAP Crystal Reports 2013
• SAP Crystal Reports 2016
• SAP Crystal Reports 2020

1. Create a report in Crystal Reports 8.5 with a formula with name @myFormula
     
2. Write the following code in formula @myFormula: 
      
       StoreStringVar('var_name','var_value');
     
3. Migrate the report to a newer version of Crystal Reports.
      
4. It will then generate the error.

• The functions StoreStringVar, StoreNumberVar are implemented in the User Function Library (UFL) u25store.dll, and it is not distributed with Crystal Reports.
    
• A User Function Library (UFL) is a way to add additional functions in Crystal Reports. This UFL was created for Crystal Reports 5 and 6 to be able to share data between subreport and main report. ( Subreport were added in Crystal Reports 5 ) 
     
• In Crystal Reports 7, shared variable was added to the core product to be able to share values between the main report and the subreport, therefore no external UFL like: u25store.dll is required to share values with a subreport or main report.

• Uses Shared Variable to share values between the main report and subreport.
      
• For example, in the formula @test, replace the code from: 
  
      StoreStringVar('var_name','var_value')
  
  To 
  
      Shared Stringvar var_name := "var_value";

UFL that implements this function is missing, u25store.dll, u25store. , KBA , BI-RA-CR , Crystal Reports designer or Business View Manager , Problem

SAP Crystal Reports 2013 ; SAP Crystal Reports 2016 ; SAP Crystal Reports 2020