Found the following math rendering problems:
bootstrap.geoGAM.Rd:33: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_{+}}…
bootstrap.geoGAM.Rd:33: Undefined control sequence: \ensuremath in \tilde{Y}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_+}})…
bootstrap.geoGAM.Rd:41: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})^{…
bootstrap.geoGAM.Rd:41: Undefined control sequence: \ensuremath in …t f(\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))
bootstrap.geoGAM.Rd:44: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})^{…
bootstrap.geoGAM.Rd:46: Undefined control sequence: \ensuremath in …t f(\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_{+}}…
bootstrap.geoGAM.Rd:47: Undefined control sequence: \ensuremath in …t f(\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_{+}}…
bootstrap.geoGAM.Rd:47: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_{+}}…
bootstrap.geoGAM.Rd:48: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})^{…
bootstrap.geoGAM.Rd:53-56: Undefined control sequence: \ensuremath in …t f(\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s_{+})…
bootstrap.geoGAM.Rd:62: Undefined control sequence: \ensuremath in …tilde{Prob}}(Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})=r…
geoGAM.Rd:51-57: Undefined control sequence: \ensuremath in …t}\mathrm{E}[Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})\,…
geoGAM.Rd:59: Undefined control sequence: \ensuremath in f_{j}(x_{j}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))
geoGAM.Rd:60: Undefined control sequence: \ensuremath in x_{j}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})
geoGAM.Rd:66: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:67: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})
geoGAM.Rd:71: Undefined control sequence: \ensuremath in \mu(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:74: Undefined control sequence: \ensuremath in …j} f_{j}(x_{j}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))
geoGAM.Rd:78: Undefined control sequence: \ensuremath in f_{\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\scriptstyle \…
geoGAM.Rd:82: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}
geoGAM.Rd:83-84: Undefined control sequence: \ensuremath in f_{j}(x_{j}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})) …
geoGAM.Rd:85-86: Undefined control sequence: \ensuremath in f_{\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\scriptstyle \…
geoGAM.Rd:87: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}
geoGAM.Rd:90-91: Undefined control sequence: \ensuremath in 
      g(\mu(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:92-97: Undefined control sequence: \ensuremath in …{u}}(x_{j_{u}}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})) …
geoGAM.Rd:98-106: Undefined control sequence: \ensuremath in …e{ \sum_{w} f_{\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\scriptstyle \…
geoGAM.Rd:115-116: Undefined control sequence: \ensuremath in g\left(\mu(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:120-125: Undefined control sequence: \ensuremath in …    g\left(\mu(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:129-135: Undefined control sequence: \ensuremath in 
      \mu(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:140-141: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}) \…
geoGAM.Rd:143-150: Undefined control sequence: \ensuremath in …mathrm{Prob}[Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}) \…
geoGAM.Rd:154-158: Undefined control sequence: \ensuremath in …mathrm{Prob}[Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})\l…
geoGAM.Rd:160: Undefined control sequence: \ensuremath in …mathrm{Prob}[Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})\l…
geoGAM.Rd:162-163: Undefined control sequence: \ensuremath in Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}) \…
geoGAM.Rd:163-164: Undefined control sequence: \ensuremath in (\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}) \…
geoGAM.Rd:192: Undefined control sequence: \ensuremath in f(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
geoGAM.Rd:197: Undefined control sequence: \ensuremath in …f}( \mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))^…
geoGAM.Rd:200: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{U}}^{[…
geoGAM.Rd:202-203: Undefined control sequence: \ensuremath in …
  			\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))_…
geoGAM.Rd:203: Undefined control sequence: \ensuremath in \̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{U}}^{[…
geoGAM.Rd:204: Undefined control sequence: \ensuremath in g(\mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))_…
geoGAM.Rd:206-207: Undefined control sequence: \ensuremath in …f}( \mathbf{x}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))^…
geoGAM.Rd:239: Undefined control sequence: \ensuremath in f_j(x_j(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}}))
predict.geoGAM.Rd:41-46: Undefined control sequence: \ensuremath in …	\mathrm{E}[ Y(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{s}})\,…
predict.geoGAM.Rd:48: Undefined control sequence: \ensuremath in \hat f(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:50: Undefined control sequence: \ensuremath in …x{Var}[ \hat f(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:50: Undefined control sequence: \ensuremath in \hat f(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:54-58: Undefined control sequence: \ensuremath in …}(s) = \hat{f}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:60: Undefined control sequence: \ensuremath in \hat{f}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:60: Undefined control sequence: \ensuremath in Var[ \hat{f}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…
predict.geoGAM.Rd:60: Undefined control sequence: \ensuremath in \hat{f}(\̲e̲n̲s̲u̲r̲e̲m̲a̲t̲h̲{\mathbf{x}}(\e…