Dispensationally considering scripture is not the error. The error comes from ignoring dispensational consideration of scripture. You have PROPHECY and MYSTERY. If you ignore the 'mystery' revealed to Paul you are ignoring some important information for you as a member of the church which is his body.
The first resurrection of Revelation is talking about Israel's prophesied resurrection; actually 2 resurrections separated by a period of 1000 years. (John 5:28,29, Revelation 20:4-6) Verses 12 through 14 are about the final resurrection of the unjust who then experience the second death and go to the lake of fire.
The body of Christ will experience something that WAS a MYSTERY revealed to Paul.... (NOW WE CAN SEE IT..we've been told..let's not ignore it)
1 Corinthians 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
1 Corinthians 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,1 Corinthians 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. 1 Corinthians 15:53 For this corruptible must put on incorruption, and this mortal must put on immortality.
The body of Christ is not appointed to wrath... will not go through the great tribulation and will be taken out before that happens...the "out resurrection" ...if you miss the mystery you miss that wonderful truth. It's not error....it's truth....we shall all be changed in a moment in the twinkling of an eye.