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I just ran into this, although in the error instead of 'rwservlet', I had a random filename (eg: 3lf243pf.htm). It turns out in my case, the parameter page had a field with an invalid source (null, in this case). I closed and reopened the report, then deleted the offending object and re-saved. When I ran it next, it was fine.
I'm using OFM 184.108.40.206.
yes, as user13587502 stated check your parameter form. For more details about this issue check the following support note
One Report gives Rep-50134 : Cache Subitem filename.Htm Does Not Exist then Cannot Run Any Reports (Doc ID 1442503.1)