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I treid to reproduce the error and for me this only occurs when the file doesn't exist. Please navigate to the folder where the bag-file lies. e.g:

cd /path/to/file

(I don't knoe where this is in ur case.)

And make sure, you have read access there! then use:

rosbag play mylaserdata.bag

I treid tried to reproduce the error and for me this only occurs when the file doesn't exist. Please navigate to the folder where the bag-file lies. e.g:

cd /path/to/file

(I don't knoe know where this is in ur case.)

And make sure, you have read access there! then use:

rosbag play mylaserdata.bag

Maybe ther is also a typo. (Check the name you used when recording the file)