Discoverer error (about memory)

[Quoted] When trying to open some bigger workbook from database, Oracle9iAS Discoverer shows error.

 Discoverer Plus shows:
 No data is shown because an error occurred while running the query.

 The error message is such:
 The server is running low on virtual memory. This can happen due to  insufficient disk space or heap space on the server. Please contact  your Discoverer Administrator for assistance.

 The AS has fysical memory 512MB, virtual - 1,5GB. Used virtual ~1GB.  There isn`t shortage of disk space or virtual memory of AS machine. I  suppose the problem is in Discoverer configuration.

 The memory settings in pref.txt file are default: [Application]
CacheFlushPercentage = 25 # Percent of cache flushed if the cache is full.
MaxVirtualDiskMem = 1024000000 # Maximum amount of disk memory allowed for the data cache.
MaxVirtualHeapMem = 5120000 # Maximum amount of heap memory allowed for the data cache.

 Are there other files wich define the memory settings for Discoverer?

 What I have to do?

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