Using groovy to set substitution variables for non admin users - REST API connection issue

Summary:

we are using groovy to set substitution variables for non admin users, but we are getting below issue , Could you please guide us.

A validation error was received from the Planning server.
'Error:The Groovy script failed to compile with internal error: Compile Error:
Expression [ConstructorCallExpression] is not allowed: new java.net.URL(Vaccines) Rule Vaccines.Vaccines.New Spread Test'

Content (please ensure you mask any confidential information):

Below Code is working fine with admin credentials but we need to executive same business rule for non-admin users,

we updated business rule with REST API connection but we are getting error,