# \-ro ( reports only) is not working.

**URL:** <https://community.gatling.io/t/ro-reports-only-is-not-working/2968>\
**Category:** Gatling (Open-Source)\
**Created:** [April 29, 2016, 4:30am UTC](https://community.gatling.io/t/ro-reports-only-is-not-working/2968 "2016-04-29T04:30:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![AJITH\_SHETTY](https://avatars.discourse-cdn.com/v4/letter/a/a88e57/32.png) [@AJITH\_SHETTY](https://community.gatling.io/u/AJITH_SHETTY)\
**Post date:** [April 29, 2016, 4:30am UTC](https://community.gatling.io/t/ro-reports-only-is-not-working/2968/1 "2016-04-29T04:30:51Z")

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Hi team,

Gettting following error once i run “gatling.bat -ro reportsOnly” where reportsOnly is folder in "GATLING\_HOME/results

Exception in thread “main” java.lang.reflect.InvocationTargetException  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)  
at java.lang.reflect.Constructor.newInstance(Unknown Source)  
at io.gatling.core.result.reader.DataReader$.newInstance(DataReader.scala:31)  
at io.gatling.app.Gatling.start(Gatling.scala:77)  
at io.gatling.app.Gatling$.fromArgs(Gatling.scala:59)  
at io.gatling.app.Gatling$.main(Gatling.scala:44)  
at io.gatling.app.Gatling.main(Gatling.scala)  
Caused by: java.lang.NumberFormatException: For input string: “”  
at java.lang.NumberFormatException.forInputString(Unknown Source)  
at java.lang.Long.parseLong(Unknown Source)  
at java.lang.Long.parseLong(Unknown Source)  
at scala.collection.immutable.StringLike$class.toLong(StringLike.scala:276)  
at scala.collection.immutable.StringOps.toLong(StringOps.scala:30)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$io$gatling$charts$result$reader$FileDataReader$$firstPass$1.apply(FileDataReader.sc  
ala:90)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$io$gatling$charts$result$reader$FileDataReader$$firstPass$1.apply(FileDataReader.sc  
ala:83)  
at scala.collection.Iterator$class.foreach(Iterator.scala:742)  
at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)  
at io.gatling.charts.result.reader.FileDataReader.io$gatling$charts$result$reader$FileDataReader$$firstPass(FileDataReader.scala:83)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$6.apply(FileDataReader.scala:123)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$6.apply(FileDataReader.scala:123)  
at io.gatling.charts.result.reader.FileDataReader.doWithInputFiles(FileDataReader.scala:65)  
at io.gatling.charts.result.reader.FileDataReader.(FileDataReader.scala:123)  
… 9 more

Regards  
Ajith shetty

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<div class="post-metadata">

**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\
**Post date:** [April 29, 2016, 7:59am UTC](https://community.gatling.io/t/ro-reports-only-is-not-working/2968/2 "2016-04-29T07:59:47Z")

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You’re probably trying to user Gatling 2.2 to parse a log file produced with Gatling 2.1 or vice versa.