ambiguous implicit conversion

I am having an implicit conversion rejected because it is supposedly
ambiguous. However, the two potential conversion functions that scalac
points to are the same function! (I've verified that I don't have two
copies of the same function.) Has anyone encountered this problem
before? If so, is there a way around it? The output follows. Thanks.

--Russ P.

[error] /home/xxx/code/src/main/scala/Plot.scala:13: type mismatch;
[error] found : Int(1)
[error] required: Scalar.package.Scalar
[error] Note that implicit conversions are not applicable because they
are ambiguous:
[error] both method IntToScalar in package Scalar of type (i:
Int)Scalar.package.Scalar
[error] and method IntToScalar in package Scalar of type (i:
Int)Scalar.package.Scalar
[error] are possible conversion functions from Int(1) to
Scalar.package.Scalar
[error] Xlabel: Text="", Ylabel: Text="", Xunit: Scalar=1,