`standardOutput` does not accept a `String` value

When I set the value of `standardOutput` as `tempUtilLogs.log`, I get the following error. However when I set the value to file type as, `new File("tempUtilLogs.log")` it works.

```
Cannot set the value of task ':startTestUtilAsDaemon' property 'standardOutput' of type org.gradle.api.file.RegularFile using an instance of type org.codehaus.groovy.runtime.GStringImpl.
```