Pixelmath error

[Singlin]

I have been following Harry's LRGB video tutorial and have become stuck on the pixmath section.

PixelMath: Processing view: light_FILTER_Ha_BINNING_1_DBE
*** Error: Invalid symbol identifier: light_FILTER_Ha_BINNING_1_DBE_clone+
<* failed *>
See attachment.

Regards,
Simon

[Raymond]

Try deleting the '+' under Symbols.
Raymond