offset bigger than 65535 bytes

I am getting this error message on generating the fonts. What needs to be done to correct it.
Lookup rligRequiredLigaturesArabic02 has an offset bigger than 65535 bytes. This means FontForge must use an extension lookup to output it. Not all applications support extensin lookups.

Apart from that there are many lookups which are not working. I double checked that the combination I am entering in Word 2010 is perfect.
Please help.

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