I found the answer for the PC1500, and I'm guessing the error codes for the PC1270 will be similar. Here is what the manual says:
This error occurs when there is no DATA corresponding to a READ command, for example:
10 READ X, Y
20 DATA 10
30 END
The display will say, "ERROR 4 IN 10"
The solution is to provide enough DATA to satisfy the READ. For example, change line 20 to read as follows:
20 DATA 10,15
Hope this helps.
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