[rrd-users] pango cannot find right font, rrdtool cannot draw letters....

[rhapsody9]

I use librrd-ruby and use rrdgraph function to draw png. But it always warns
as follows:

(process:29855): Pango-WARNING **: pango_shape called with bad font, expect
ugly output

(process:29855): Pango-WARNING **: pango_font_get_glyph_extents called with
null font argument, expect ugly output

So that the png drawn can't display letters. Will anyone be kind enough to
help me?
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