1.7.10 pack crashing on startup

[Deni-Galay]

Chisel: Errors like "[FML]: Unable to lookup ..." are NOT the cause of this crash. You can safely ignore these errors. And update forge while you're at it.
[B#407] EnderIO: Found the following problem(s) with your installation:
[B#407] * The RF API that is being used (1.7.10R1.3.1 from ) differes from that that is reported as being loaded (1.7.10R1.0.2 from Flans Mod-1.7.10-4.10.0.jar).
[B#407] It is a supported version, but that difference may lead to problems.
[B#407] This may have caused the error. Try reproducing the crash WITHOUT this/these mod(s) before reporting it.
[B#407] The 1.7.10 Pack - v0.9.8b:

here is the crash report

[xJon]

Please post your crash report file using a paste-tool.

[xJon]

Closed due to inactivity.
Will reopen with the required info.