Path Variable and Query Params together returns internal server error

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Getting internal server error when i pass Path Variables and Query Params to gether in the web service get request

https://testapi.com/api/business/${SearchItem}?contract=${contractCd}&ItemFlag=true

for the above request am getting the below error
{
“timestamp”:“2019-09-17T19:47:06.742+0000”,
“path”:“/api/business/book”,
“status”:500,
“error”:“Internal Server Error”,
“message”:"Ambiguous handler methods mapped for ‘/api/business/book’: : {public reactor.core.publisher.Flux